Multiple screens support is listed as non-goal. Would that prevent its usage with window managers which support virtiaul desktops? I am i3 user and it is a critical feature for me.
As others have already mentioned, the continuous multi-monitor(Xinerama) was an afterthought. A good news is that, by design, it’s actually pretty easy to add in the later steps.
In short: No.
In X11 "screen" has a particular meaning, and only supporting a single screen doesn't preclude multi-monitor support or virtual desktops.