But i want to be able to use an app to act as a VNC server (screen capture, inputs,...), or an app (eg. tasker automation) to start a vpn connection and an ssh server when i send a SMS to the device. I just don't want a screensaver app to be able to do that.

Basically, i'd be happy if those "risky" permissions would be hidden in app management in settings, disabled by default, and enabled only by power users.

The problem now is, that due to fscked up permissions schemes, some apps are unable to work at all, even the stuff they work now, some due to play store issues (eg. termux because they want to run downloaded code), and some due to missing apis (eg vnc servers).