Linux on phones or desktops suffer from one major problem as I see it, to much choice.

You make a Windows app it has to work with the latest couple versions, same with Mac.

Make one for Linux and you have to test it against dozens of popular distros, package it in multiple ways, and hope the dependencies are gonna match.

It's an awesome system for IT people and server admins, but for the end user, ehhh... That seems to be the problem things like snap and flat packs are aimed at fixing, which could transition to phones but first you gotta herd the cats into an agreed state.