Ah, I see now that I didn't make myself clear in my previous comment. I am not criticizing the back button functionality per se, but rather the way that many apps have things set up so that it requires more, sometimes a lot more, presses of the back button to back out than it took actions (taps, swipes, whatever) to get somewhere. While this may perhaps be useful in some cases, in my opinion it is often done in a classic 'nagware' fashion, to make it more difficult to leave the app.
When I press the home button, this often doesn't close down the foreground app entirely, so after a while of doing this I will end up with lots of apps running in the background, which I don't like because often they keep consuming power even when backgrounded and may also continue gathering data about me that way.
I am aware that apps can also install and run background services separately from the app, but in my experience, the apps that I use tend to also shut down these services, as long as I exit the app entirely, using the back button.
When I press the home button, this often doesn't close down the foreground app entirely, so after a while of doing this I will end up with lots of apps running in the background, which I don't like because often they keep consuming power even when backgrounded and may also continue gathering data about me that way.
I am aware that apps can also install and run background services separately from the app, but in my experience, the apps that I use tend to also shut down these services, as long as I exit the app entirely, using the back button.