I've tried it in the past and all that could be done was due to the platform not having e2e encryption on standard chats.
- much much better performance - a good desktop client - open source message clients - scheduling messages - better search - many small gestures/UX features that feel thoughtfully implemented - better channels - message threads - chat folders - very easily programmable & deployable bots for moderation or implementation into your work flow - a lot of customisable settings
Telegram is so much further in performance and feature than it's counterparts it's laughable. Almost all of the new features in Whatsapp/Signal were first implemented in Telegram.
Some of them, as you said, are feasible because of the non-e2ee chats, but a lot of them are just plain universal.