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.
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- 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.
I think one point not raised here is that Telegram is an attempt to create a global Asian style messenger with quick, sleek and maybe too animated (to my taste) design and vibrant ecosystem.
Whatsapp cannot be fast - otherwise Grandmas will not be using it, so Meta always has to compromise, while Telegram can just adapt WeChat/Line features for years with WA limping behind.
Signal is cool for people that consider privacy paramount. If I get it right, they are also on a mission of creating safe communication for the most vulnerable. They are just different; I could never make myself start using TikTok, and can completely relate to someone saying Signal has just the right amount of features one needs.