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How many of those have full functionality? I know that WhatsApp is just a client for the mobile app, without voice and video.

Signal and Telegram include audio/video functionality on the desktop.

Also, not sure what they do to it (no Electron?), but Telegram feels super fast, really pleasant experience.

The fact that Telegram is a Qt app that looks nice and is lightweight makes it really good; it's just a shame it's centralised.

Almost any other messaging platform is dominated by Electron clients (bar the few very WIP Matrix clients such as Neochat).

It has voice and video now (marked 'beta' and only for 1-to-1 calls).

But I agree, all of these clients suck in their own way. :(