I take a different approach:

I run a proxmox server on my home Lan with all the services and storage I want, including a wireguard server. My Android phone can then connect to my home LAN services from anywhere in the world (my ISP provides static public IP addresses).

My Android device is then a simple terminal to all my "stuff". It can be locked down as much as they want it to be, as long as it can run WireGuard. I have no use for a rooted phone. In fact I want it to be as hardened as possible in case of theft.