Isn’t it a bandwidth issue? If not that, then probably it’s just too expensive to produce for a prosumer-grade product. I think there’s a market for this product, as there’s presumably a market for the Studio Display that they’re trying to compete with, but I would guess that this quickly drops to ~$1000 if they actually want to move these. Making this with a 5k/120fps display would certainly push their price above Apples and I just kinda doubt there’s enough of a market. Pricing it equal to the Studio display seems like they’re just testing the waters but no way can be a long term thing.
As far as data, ok. Haven’t ever looked for an 8k display. Nothing in the Apple world seems to do 90hz though, it’s 60 or 120. I wonder if MacBook Pro support display outputting those high res/high refresh rates also.