Android used to be an OS for cameras, but was bought by google to make a smartphone OS. Not saying what you are saying isn’t true though.

I did do a lot of configuration actually to it.

I just picked Alpine Linux for security and efficiency built in mind out of the box. It still required a lot of configuration, for lowering attack surface and hardening.

I know you asked for a lightweight distro, but from a security standpoint, I recommend using whatever allows you to relock the bootloader. Which looking up I dont see any choice. If relocking doesnt matter, then any distro for speed is basically any distro that comes with as minimal stuff as possible.

Also, I might be wrong so do some research

I personally use it as a desktop.

I don’t understand, isn’t what makes it a desktop or a server what you want to do with it? Because it has just enough apps and utilities for me to work with it.