I sincerely hope someone took the Telegram client code and add Matrix protocol to it. Really, Telegram client is open source and the app is more usable than any other bloatware on the market.
Agreed, the Telegram desktop client is super fast. EDIT: Someone seems to already have done this: https://matrix.org/docs/projects/client/nheko.html
I agree it'd be awesome if someone took the actual Telegram FOSS clients and ripped out the TG backend and replaced it with Matrix (a bit like the Delta.chat folks did, but replacing with email)