[zegerjan]

Except they've rewritten their Mac app in Swift now. So there must be a reason they moved away from that.

[Kipters]

They didn't rewrite the app. There are multiple official apps, you could also write your own (that's what is happening for Unigram, an open source UWP client for Telegram)

[narrowtux]

Probably because Qt apps don't feel like native macOS apps.

[Gonzih]

telegram-desktop and telegram for mac are different projects