I'd buy a $1500 Apple monitor if for no other reason than the fact that Apple would actually put a decent set of speakers on it¹, like they did with the Apple Cinema Display.
¹It's not clear to me if the Pro Display XDR actually has speakers at all, but its audience can be expected to buy a set of high-end speakers too, whereas a monitor aimed at actual users would need built-in speakers.
More to the point, it's unclear if Apple is still actually selling that LG display, though:
https://www.engadget.com/2019/05/09/apple-no-longer-selling-...
That headline is phrased as if it's definitive, but of course Apple hasn't said anything. But it's over a month later than that article was published, and the display is still listed as "Delivery: Sold Out" for online ordering, and it appears to be catch-as-catch-can at physical Apple stores: the ones that don't have it just list it as "unavailable for pickup."