Whenever a changelog says stuff such as 'Radical new design!' 'Reimagined app interface!' or 'Refined design' I avoid it entirely. But of course, I haven't updated any app on my 6S since I bought the darned thing. I did update to iOS 14 but only after doing extensive research (After iOS 7, I stopped trusting Apple) but that was it. It didn't slow my phone down, and didn't break any apps, and it fixed a few bugs. I rarely though if ever make exceptions for updates.
There's always going to be someone who spreads the FUD of "older software will always be unsecure! don't use it or you'll lose your identity!" but that's it, FUD. If you don't browse pirate sites, or porn, or use sketchy apps, you have nothing to worry about. The PowerPC area still has active development (TenFourFox, etc) and Windows XP and even 98 SE have compatibility for internet browsing (The Old Net, Browservice, even a modern web browser!)
If everyone bought into the myth that using older software will get you hacked (seriously, how dumb must one be as a hacker to target the literal 5% of devices out there! Especially if you can't even show those 'your PC has been locked by Microsoft' popups) then sites such as Theoldnet.com, oldapps.com, oldversion.com and the like wouldn't be there for the few of us who don't like modern apps.
Older software isn't useless either. Many of them still function. When I used my HTC Thunderbolt earlier this year (yea, still working despite not officially being VoLTE compatible!) there was an app I had backed up to my NAS (eRadar HD) from the year 2009! The old phone is old enough to support it still, and I actually opened it to see the status of a severe storm approaching our area, and it still worked. Developer isn't even around but app still works. The Kindle app still works on my Galaxy Tab 2 7.0 from 2012, and the browser on my Galaxy Note 10.1 (2012) still works with YouTube.
Hey, if you like modern apps, go right ahead. Another odd thing I read online and experience in public sometimes (the odd random person who dares catch me using my Thunderbolt!) is the accusation of 'you luddites are holding us all back! embrace the future!' It was even uttered at least once in this very thread a few pages back! Seriously, how on earth will me using a phone from 2011 hold back technological advancement?! People don't see me using a 10-year-old phone and suddenly stop buying things (although the planet would be all the better for it!). Me using old stuff won't change progress. I will embrace what I want, use what I want, thank you very much!
Then there are the few funny yet ironic instances where someone sees one of my old phones in use, isn't really up on tech or what's new and the like, and catches me using my Galaxy S-Relay phone (sliding keyboard and all!) and says "Hey where did you get that?! It's cool! I never knew they made phones with keyboards except BlackBerry!" sometimes they make a mention of how they always hated on-screen keyboards, asking where they can buy a slider, and I have to break it to them that sliders, much like other unique phones, along with features you paid more for, such as headphone jacks, IR blasters, home buttons, etc haven't been made in awhile or will show signs of coming back. There's a whole market out there being completely ignored because companies can't admit that what they do now or call an 'upgrade' is a mistake. There's nothing wrong with variety.
Seriously, though, where's the upgrade from a 6S to a 12 Pro? No headphone jack, no Touch ID, no home button, no 3D touch. Seriously why would I pay far more ($1000+) for less than I have now?! Does that make sense to anyone?