At this point, I think the Beta is virtually finished software. Seems to run without issues for me so far.
As for cameras. Yes, I'd love to see S23 Ultra cameras on the Z Fold 5.
But the S23 Ultra is geared for the best of everything. It's a showcase flagship if you like.
Z Fold 5 is much more for productivity. The cameras, and especially the Zoom camera, will take up room. The phone is quite heavy. To add those cameras will add bulk and weight
That said, I'm really happy with what they can do now. They surprised me from the first time I used them