Presumably there's a lot more modern software written for Linux which you'd end up running through a compatibility layer from Haiku? The better option seems relative. I could be misremembering how Linux programmes are handled on Haiku though.
But Haiku has the soul.
We don't need to clone UNIX all over the place.
Perhaps it’s better to play it safe and just run DOS instead ;)
BeOS on its final commercial version certainly did not allow to compile UNIX applications, beyond the common surface that is part of ISO C and ISO C++ standard library.
To work around this, all window messages in ported apps are marshalled to execute sequentially. Small additional overhead, and the system doesnt spread available threads, so noticably slower.
Compare a native Haiku app with a ported app, one is smooth as ice while the other isnt. Users notice it. This is on many core systems.
I'm no expert, but aren't you just talking about Xorg here? As far as my limited knowledge goes, there's nothing inherent in the Wayland protocol that would imply this.