Remote server access from anywhere is a huge one. Saves me from dragging a laptop everywhere just in case I need to troubleshoot something.

You can also assign scripts to launcher icons, and there is a widget too, which eases the pain of working from a mobile keyboard. Just click a button to run commands.

https://github.com/termux/termux-widget

My phone also has usb-c video out, so it's even better when I'm hooked up to a larger display + keyboard and mouse. Pocket terminal ftw, and I didn't have to spend money on some raspberry pi cyberdeck that I'd never carry anyway.