xpra: it is like tmux but for X windows (works on wayland), but it can do much more than that. You can seamlessly run GUI programs from a container or VM on your main desktop while still sandboxing their X capabilities, forward windows from Windows desktops, and it has efficient encoding so it is usable over poor connections as well.
technically there is a lot it could do, but it would not be a number 1 pick for any of it (even if you only have a $100 budget) so i agree, get rid of it.