When I was talking about "battery charging", I meant using an app to limit the charging at a certain level: look for "acca" or simple "acc" which is the module/daemon to manage that. You have to be root to do that and there is no way around.
For the rest, sure, but that's for GrapheneOS, I was talking in general, most ROM not having what GrapheneOS has and considering GrapheneOS is exclusively present on Pixel phones unfortunately…
If you mean apps that allow you to restrict permissions of other Apps, there's App Ops, it works with Shizuku
You can do some customization with adb/Shizuku but for some things you might need root. But I would definitely value security over customizability.
The OS can do that pretty well
GrapheneOS has a built-in firewall that you can use to block network access to any app on the system.
You can do that with DNS services like NextDNS
GrapheneOS has a built-in backup solution
When I was talking about "battery charging", I meant using an app to limit the charging at a certain level: look for "acca" or simple "acc" which is the module/daemon to manage that. You have to be root to do that and there is no way around. For the rest, sure, but that's for GrapheneOS, I was talking in general, most ROM not having what GrapheneOS has and considering GrapheneOS is exclusively present on Pixel phones unfortunately…