But Vitruvian is running its own graphics stack so no X11 or wayland applications will run afaict.

Not quite really. Vitruvian runs virtually the same identical sw stack of Haiku and there's a haiku-wayland that works. However on vitruvian the app_server could provide real Gbm buffers, so that would give us pretty much native rendering. We're still working on it but you'd have the advantages of a BeOS-like gui and the power of linux!

So what's the point of this -- it's essentially a different Haiku?

I think itbis the reverse, it is haiku with a linux kernel so it works with more hardware.

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With xlibe they should.