To effectively capture discord usage telegram should add Group groups, that is to allow user to create an Organizations with some channels and groups.

Also some kind of shared access policy.

Could even be a pro feature.

I specifically like Telegram because it doesn't have group groups =)

I don't use discord or other complex chats much, are there annoyances that come up with group groups?

Desktop client already has it, it's called 'folders'.

That is client side; there is no functionality comparable to how discord groups chatrooms by server