Honestly these things are not the biggest worry.

You can use a pretty standard config. You are likely not going to be writing pages of code and for prose there are better things on a phone than the keyboard. You can get pretty far though github searching Emacs lisp files with android in the text.

More interesting is dealing with androids permissions. The original article mentions this and I have some notes here. https://gsilvers.github.io/me/posts/20250921-emacs-on-androi...