Couldn't agree more. Using the webapp with a chromium-based browser is such a better experience (working screen-share, hw-accel, etc.) I couldn't imagine going back.
And especially with chromiums --app flag (I just have a .desktop file that Execs `flatpak run com.github.Eloston.UngoogledChromium --app=https://discordapp.com/channels/@me --enable-features=UseOzonePlatform --ozone-platform=wayland`) it really feels like an "app" experience (exception being, that pressing on links in chat opens them in a new chromium window and not firefox).