I switched from IRC to matrix in 2018 specifically because I found mobile difficult.

I used the suggestion in your linked document by running irssi in a tmux session on a VPS I paid for, then using a bridge to an app on my phone. I found the experience to be cumbersome even for someone like myself (and even then irssi required reboots or else it would lose performance over time).

I wanted to use IRC for a family chat, but I couldn’t possibly convince my friends and family to go through the same client setup as I did.

In my opinion there are use cases that either IRC or Matrix would be preferred over the other (not to mention other self hosted communication software).

Are you taking about animation trees? https://docs.godotengine.org/en/stable/tutorials/animation/animation_tree.html