Why do they need to? Sure it'll be nice, but depending on your market, maybe that's an unnecessary implementation detail.
"Waydroid uses Linux namespaces (user, pid, uts, net, mount, ipc) to run a full…" [see main page]
when in fact they simply use LXD, which uses all these features. Besides, it is a project dependency, which is not mentioned anywhere.
Edit: clarity.