that is changing "soon" (with an ever-changing definition of "soon")
I believe all application logic is moving to .net with the visible elements being HTML & CSS, but do not remember where I read it, so take it with a grain of salt.
if there was mention of react native, I do not remember it, but I gloss right over mentions of most web frameworks, so it may play a role.
It's probably worth me mentioning that I'm building a Teams client using Typescript and Tauri! https://opercom.co.uk
https://github.com/ItzLevvie/MicrosoftTeams-msinternal/tree/...