Debian based distros are good, but I always had problems with the slow releases. And no idea how well that works out for GPU drivers if you plan to play new games

There is also Shizuku that might be utilized in der Future to install apps (Im just speculating here)

Well yes, but actually no.

On a more serious note, most things are available, some things are behind on updates unless you compile everything yourself (even when using the ports collection).

I haven’t used it as a desktop environment, I was just maintaining a FreeBSD server, so no idea on that end