Its a fork of Termux terminal app. So, just command line stuff, but if you use the terminal, it's cool to have the same tools available on your phone. Some of my favorites are fzf, buku, newsboat, rsync, and readability-cli (which I use to save web articles and strip out ads and distractions)

I don't game, so I guess I don't feel like I'm missing much. Also, I'm willing to sacrifice convenience for control of my data. I enjoy learning a little about how computers work and creating scripts. Once you get used to Linux, you get more tuned into open source projects and people's contributions.

NixOS on my laptop and server, nix-on-droid on my phone. I use home-manager and have (nearly) the same scripts and aliases set up on all three devices. Love it.