Who is this system for exactly?
The only situation I've ever found NUC and NUC-a-likes useful for is bolting to the back of a monitor or TV where there is simply not enough space for even a very tiny footprint. Given that something miniscule like a DAN A4 or much cheaper Inwin A1 can house a full desktop system in a tiny footprint, you'd only turn to this NUC-like form factor if the footprint had to be even smaller, or literally zero.
I use them on CAD/CAM workstations and 3D laser cutting beds where a touchscreen monitor just about fits somewhere on top of the unit and the PC has to attach to that. I've also built a few for people as a way to dissuade them from wasting money on an AIO that will force them to throw away a perfectly good screen when the integrated PC gets too old or dies. If you have only a tiny desk and nowhere else to put a PC, something that can rest on top of the monitor's stand or behind the monitor is a niche but viable market demographic that buys these things. We also have some mobile displays on trolleys that use a wireless air mouse and having the most powerful system that could be bolted to the back of the TV was a good thing, these days it's just so much easier to stream content to them from a dedicated graphics workstation with significantly higher specs.
Now, the real question is
'what's the venn-diagram intersection between someone who has those space constraints and someone who needs an expensive top-tier Renoir chip instead of something far cheaper?' The performance of this is great for its size - but AIO buyers and industrial use, PoS, or thin-client customers aren't going to need that performance. Also, if you have $900 to burn, surely you also have the funding to solve your space-constraint issues too?
I'm sure someone will find a valid use-case for this but I'd be willing to bet that most people buying this are just buying it because they find the idea of performance density awesome, and have plenty of disposable income to burn on something like this just to satisfy that particular itch.