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I recently upgraded from iPhone 6S (on iOS 15) to a 13 pro. The experience definitely is not as great as on later iphones. However, most features work great On the 6S!
 
Why? With a replacement battery my 6s+ is as agile as ever.
Same here, I wanted to at Best Buy or the apple store, but they said they would HAVE to update the phone to iOS15 to replace the battery. So I went to a 3rd party mobile phone store that replaces batteries, the installed one with WAY more MAH that apple OEM battery and charged me less than Apples $49.99 price and my phone is good as ever. My issue on iOS 12 is a dozen apps I use no longer work on my current iOS and wish I had updated to 13 when it was out. Really bummed on this control and game apple plays with users. On my mac Pro Tower I can go to Yosemite, Sierra, High Sierra, Mojave anytime all day long.
 
Same here, I wanted to at Best Buy or the apple store, but they said they would HAVE to update the phone to iOS15 to replace the battery. So I went to a 3rd party mobile phone store that replaces batteries, the installed one with WAY more MAH that apple OEM battery and charged me less than Apples $49.99 price and my phone is good as ever. My issue on iOS 12 is a dozen apps I use no longer work on my current iOS and wish I had updated to 13 when it was out. Really bummed on this control and game apple plays with users. On my mac Pro Tower I can go to Yosemite, Sierra, High Sierra, Mojave anytime all day long.
For Apple & 3rd party developers having to support so many versions of iOS & macOS is a cost center for them.

This is why Apple actively limits iOS downgrading.

Android fragmentation is a headache iOS does not have to deal with.

Be aware that the stated mAh of 3rd party batteries may not be actually true and may not last as reliably as long those from Apple.

But then again if the device is that ancient then it's relatively cheap fix until something happens that necessitates a replacement.

I still wish replacement batteries are still $29 so replacing them would be cheap. Better yet allow for user replaceable batteries so we can do it ourselves.

But doing so would cut into funds for R&D spending for future devices. Would Apple have the lion's share of the 5nm node process that the iPhone, iPad and Macs are using if their device ownership stretches out to a decade?

After 1 decade's use I am happy to retire my Mac with a 22nm Intel chip for a Mac with a 5nm or smaller Apple chip.

As for Macs being able to install whichever version of macOS it may limit you to the software set you have today as future development will not support all Intel Macs after year 2030. Would not be surprised if Intel Macs becomes a target of malware.

Same with iPhones running on iOS 14 or older.

I have observed that macOS Software Update lasts up to 8 yrs and receives another 2 years of Security Updates. On its 10th year of release it is abandoned.

If you want to still continue to use your old Mac with abandoned copies of macOS then isolate it from the Internet if you value your privacy & personal financial data.
 
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Just made the error to upgrade my SE (2016) to iOS15 (I was on an ancient ios 14 version).
Before the phone was snappy and could last easily two days of battery (I didn't use it much, almost no data, mostly calls and offline music play).
Now it drains battery like crazy, specially on call...reboot it already but didn't help.
 
I have iOS 12.4.1 on my 6S plus and haven't upgraded (from personal experience from the iPhone 3 and 4S, I have learned you can only upgraded about 3 full versions max before slow, laggy weirdness). The issue I have having now is every single week or so, an app no longer works and needs at least iOS 13 (i.e. Amazon, Best Buy, Home Depot, Lowes, Walmart, etc., etc.) Is there ANY way to upgrade to iOS 13 or maybe 14 and not the latest iOS 15?
There isn't. Apple is still releasing new iOS 14 updates to people already on iOS 14 but you had to have it installed beforehand.

App support is something you have to balance with staying on an older version. After a certain point not updating hinders the usefulness of the device.
 
Just made the error to upgrade my SE (2016) to iOS15 (I was on an ancient ios 14 version).
Before the phone was snappy and could last easily two days of battery (I didn't use it much, almost no data, mostly calls and offline music play).
Now it drains battery like crazy, specially on call...reboot it already but didn't help.
If you just installed the update you may have to wait a bit for it to finish indexing and settle.
 
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There isn't. Apple is still releasing new iOS 14 updates to people already on iOS 14 but you had to have it installed beforehand.

App support is something you have to balance with staying on an older version. After a certain point not updating hinders the usefulness of the device.
I regret that now. If I go iOS 15 and have too many issues, can I go back to my current iOS 12 if it's been backed up on iTunes?
 
I regret that now. If I go iOS 15 and have too many issues, can I go back to my current iOS 12 if it's been backed up on iTunes?
Unfortunately you wouldn't be able to, backups don't change the OS version on the device. The backup would be usable but would stay on iOS 15.
 
Just made the error to upgrade my SE (2016) to iOS15 (I was on an ancient ios 14 version).
Before the phone was snappy and could last easily two days of battery (I didn't use it much, almost no data, mostly calls and offline music play).
Now it drains battery like crazy, specially on call...reboot it already but didn't help.
Same problem. Phone call severely drains battery on iOS 15. Even with screen off and using headset, a 1h phone call shows 1h screen on? I expect to see it as a background task. Tried LTE vs airplane+wifi calling, so it's not a network issue.

So basically voice call with screen off is draining as mucho juice as FaceTime with screen on. I used to get 10-15 hours of voice call on WiFi. Now I get screen time I.e. 4.5 hours.

Interestingly an internet voice call with an app (screen off) comes up as 50% screen on/50% background.

No other problems- standby, wifi music streaming and other use is normal.

Help? I attend a lot of voice call meetings so this basically means my phone is useless as a phone!
 
I just put my SIM back into my 6S and updated to iOS 15.1. Performs just as good as iOS 14 before it. Battery pretty much the same. I never update my apps so that might help, however, and I keep background app refresh off (never noticed any change from when it's on except 4 more hours battery with it turned off).

Siri works better, and on the Watch I don't have the bug where Siri times out anymore. Overall everything works just as good if not better than it did back in March when I stopped using it.
 
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