And based on just on the list above that'd be at least 11 clicks (a lot more since you'd need to find the app in the software manager first before you can click install"
On KDE: Press meta, type "discover", type "discord", click "install". Or, if you use KRUnner, press alt-space, type "discord", click "Get Discord", click "install"
Bear in mind this is how it works for all software in a proper desktop environment. Steam works the same way, or Zed, or whatever VPN you use.