The quality, not necessarily. But it's just too bad everything is smoothed out; a couple of sharp angles judiciously chosen would be great to see. I also think the Cubitus is a) a bad release, and b) not as great in finishing as Patek is capable of and lacks angles too, but that's not at issue here. I think the finishing on this Cartier is very comparable to Czapek's SXH1, which is fine (but the SXH1 costs $20 300). It's just not super impressive, considering everything. You also seem to ignore the spirit of my comment: I didn't rain on Cartier's parade and deny the watch's beauty or that it's a piece with a lot of virtuosity. But I am offering a small criticism, the overinflation of which widely misses the point of my original remark, which was largely praiseworthy. For my own preferences' sake, when it comes to this price which is highly aspirational, I'd rather opt for something better finished, of which many options exist. But this doesn't deny your appreciation for the Cartier, instead it dampens mine.
What I do think that this kind of money is very substantial and the watch should comport with it. For the same 2019 price as the Cartier, AP currently renders the steel Double Balance Wheel Openworked (availability not at issue here) with a good few sharp interior angles. Girard-Perregaux offers close to 18 or more sharp angles on their Laureato Skeleton, which is available at $43 600 brand new; a remarkable feat. So it is certainly possible to offer, though possibly at a higher price given the previous metal.