Matrix is an interesting idea that might even get there someday, but it's not there now, and won't be there next year. And even then, it's only one breaking change away from not working with some communications app I need.

And my workplace isn't going to provide a mobile just for the 2fa apps (multiple) I need, nor would I want to have to carry an extra device just for that.

It's a fragmented world out there, and going with an even more obscure and less supported solution isn't going to cut it.