The technical aspects of this review are interesting, especially the wide range of machines tested. I finished writing a review of my own[0] a few days ago, which is less technical but goes into some other aspects of the monitor.
[0]: https://www.wells.dev/dell-ultrasharp-u3224kb-squandered-pot...
Wouldn't be the first time. My previous Dell monitor, the U3818DW, had a bug with its USB-C implementation that only affected Macs (somebody proved via protocol inspection that they were actually implementing part of the protocol wrong; it just didn't manifest on Windows). Their support forums for the issue are full of a single Dell representative whose sole response was to remind all of the Apple users that _technically_, Dell never qualified this monitor for macOS, and it's their fault for not carefully reading the technical documentation before purchasing. (Naturally, many of the reviews on Amazon are of people plugging it into a MacBook Pro.)
Really soured me on the idea of buying a Dell monitor for anything Apple related after that.
The other issue is its cost. Expectations raise alongside price, and at an MSRP of $3200 they’re pretty high, and this monitor in my opinion doesn’t meet the bar… with its build quality, problems, and lack of polish it’d maybe make sense at half that price, but even then that antiglare coating would make it a hard sell. They’d need to at least change the coating to make it resemble that of a more traditional matte monitor (which has no grain or sparkle effect).
And you’re right, there isn’t really an alternative except the Pro Display XDR, which is priced far beyond what many of us would find reasonable, uses increasingly dated local dimming tech, and has no extra functions beyond the hub on its back. That’s part of why I was disappointed: everything was lined up for Dell to have been able to knock this one out of the park — it would’ve been easy — but they didn’t.