Of course, Haiku is not able to utilize the workforce of Apple, but porting things over from other OSs is just introducing all those layers despite having a system, that is superior (the properties you like and pointed out above).
But without a clear goal, it’s hard to make a dent (if that’s even possible).
What does Haiku want to be?
Best Audio platform?
Best AI platform?
Best Video/Media platform?
A place to fiddle around with OS ideas?