I think the only way Apple would ever be able to clear up this misconception (that apps in the app switcher are actually using resources) would be to get rid of the app switcher altogether. Why people continue to liken iOS to Android in this respect will forever confuse me. I see it so frequently with iPhone users where they go into their app switcher immediately after closing an app to swipe it away. What they don't understand is that by doing that, it's actually costing them battery life because iOS has to start from scratch and reload everything when they go to use that app again.
There's hundreds of articles out there explaining this if anybody thinks I'm full of it.
That isn't strictly true as some apps cause more battery drain when left than when closed.
Three that I can think of straight away are:
Facebook Messenger.
If i leave those apps in the switcher then the background activity keeps increasing. As an example at one point all three apps on my phone in a 24hr period had around 30mins of actual usage and almost 4hrs of background activity!!! This is on an iPhone X running the latest OS and App versions. However if I close those apps after use then i don't get more than about 20-30 mins background activity in any 24hr period.
Granted this is more of an App issue and than an iOS issue. But if the app is to be suspended after a period of inactivity then it should stop ALL functions and activity unless explicitly expressed by the user.
I've stopped using the facebook app now and use a safari shortcut instead.
Since always closing these 3 apps (now 2) i find that i have around 10% more battery left between charges. But the rest i leave to suspend as with testing it never made a positive difference for battery life.
Screenshot here to show what I mean about WhatsApp. This is from today with me force closing the app after use.
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This is one that I saved when I started testing and was from leaving the app open. As you can see the time on background activity is near double the time in use. This is in a location with a full WiFi signal so it’s not as if the app is looking for a signal.
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