You are correct. It is just the closest thing I know of that can be self hosted. Jitsi is much more complicated. Definitely open to new ideas. FWIW the cpu load and voice quality are a bit better on Mumble, but the UI/UX is inferior for most people that are used to Discord and there is no screen sharing. Jitsi can do screen sharing but it is a much more involved setup that I don't foresee many people doing.