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Plus you can force a cache flush in iOS by pressing and holding the power button until you see slide to power off then release power key and hold home button until returned to home screen your entire cache is now flushed.

This is not cache, this is cleaning the RAM which isn’t necessary if everything is fine.
 
If you try to download a big movie from the iTunes Store, iOS will automatically delete quite a lot of cache! Try it with Titanic or something as big.
That’s doesn’t work anymore. It streams the video instead and charges you for the pleasure.
 
In Apple's apps, you used to be able to click the tab 5 times and it would delete the cache and reload the app but that also does not work anymore ever since APFS.
 
I believe cswifx correctly touches upon the why. It is a tradeoff between necessity and prevention of bad user behaviour. The app switcher already demonstrates that users will misuse the capability due to misguided assumptions. Manual management of caching will probably lead to users going systematically through their settings every week to clean everything up. That’s not how Apple designs these systems. Caching is not bad and the system cleans up caches when it has to, ultimately prioritising additional free space for you over app caches.

If you believe that an app is caching too much then contact the developer. Deleting caches all the time will only add frustration when the app is spending energy and data to recreate them.
 
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In Apple's apps, you used to be able to click the tab 5 times and it would delete the cache and reload the app but that also does not work anymore ever since APFS.

If you're saying what I think you are, you're talking about clearing the app from memory, not actually clearing the documents & data cache. Totally different to what we're actually discussing here.
 
Right now Twitter takes up 782MB on my phone. Of that 661MB is Documents & Data that can only be deleted if I remove the app and reinstall it. Many games on my phone take up hundreds of MB with Documents & Data. Why isn't there a way to clear this cache to free up space? I'd rather have that than deleting unused apps. My guess is app cache takes up more space than little used apps.
Twitter has cache clearing! Go to settings menu. It's under data. Clears everything!
 
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I would love to see a feature build in though that would automatically clear that (per app or for all your apps).

Apple’s own apps in that menu let you clear items from it, such as podcasts, videos and music. So it’s not that it can’t be done.
 
Because regeneration of cache takes battery life. Plus, some of those caches are automagically cleared when the device is low on space. Heck, we at least can use the optimise storage features, and you can even offload apps in iOS 11.
offload is not an option, because you need internet to redowload, eg if you in subway you can't use when needed
 
People worry too much about how much data an app, or system or whatever is using. Apple is trying to leverage the storage you pay for for speed and less cell data meanwhile people just want as much free space as possible for some reason.

I'm sure there are exceptions but in my person experience I found iOS pretty good at clearing cache and unnecessary system data. My point of reference is 16gb devices, I could never find anything to delete worth while to make space. I would usually need to resort to deleting things I would have preferred not too and apps using a fraction of what they are using on my larger storage devices.

Again I'm sure there are exceptions but unless its a problem I wouldn't worry about. Apple probably just knows people would go nuts with constantly clearing cache for no reason other then likely complaining about the effects of doing so.
 
There are a few apps on the App Store that do this. I don't know if they work in iOS 11, but they definitely do in iOS 10.3.2. Magic cleaner is one of them.

Yes this app is free and i find it very good at recovering cache space. I tend to run it two or three times consecutively, as the 2nd can remove more than the initial attempt. It still works with 11.3!
 
That’s doesn’t work anymore. It streams the video instead and charges you for the pleasure.
it does work, i use War & Peace (7GB) to clear the cache on my iphone 6 16GB which never has more than 4GB available space. Obviously if you have a 32GB and over iPhone that has more available space than the size of the movie, then it will start streaming.
 
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