I have four messaging clients running on my desktop: Signal, Telegram, WhatsApp & Slack. It's not dead.
But I agree, all of these clients suck in their own way. :(
Also, not sure what they do to it (no Electron?), but Telegram feels super fast, really pleasant experience.
Almost any other messaging platform is dominated by Electron clients (bar the few very WIP Matrix clients such as Neochat).
I don't know about the others. Are any of them native?