i dream about a phone with hw switch, which would be used to lock the screen and at the same moment it would physically disconnect microphone, camera, and gps module.

not saying it is complete solution to the privacy problem, but it would be good start.

Why close the app im using just to open another?

because you can’t use two of them at the same time? what does that have to do with method of launching that another app and comparing two clicks/gestures that can be done one handed, vs typing into some search box, which is a lot more complicated and longer operation?

do you have any experience, first or second hand, with whether filing such complaint is more than just waste of time?

that is why people have icons on the desktop. you do you, but i for one don’t want to type the name of the app i am using on the daily basis instead of it being one click.