Having similar thoughts as I have finally read this entire topic to catch up, so If you have no experience of previous design interfaces, no experience with deep rich and emotionally powerful works of art (which is not Modern art by a long shot, but has had it's utility in design etc.) and the slog it took to get to that point, then we can only expect the superiors have failed to lead the juniors (or some kind of internal political screw up), and in so doing a mentorship dis-service methinks, but that's just an idea out loud, based on misgivings shared by many here.
Th word that is creeping into view is sabotage, but I'm not going to dwell on that for now.
In conclusion, I'm going to reiterate the sentiment possibly paraphrase what has already been my guiding light and take away.
It start with when I came to buy my first maaround 2008, an iMac. I think back to the one abiding thing (there are two) that really struck me.
Icons as works of Art.
This was what grabbed me, I can still see me looking at the iMac and the OS in 2008 was capable of doing what no one else was doing, giving me beautiful works of art aka icons to look at, there is artists in the interface, I remember gazing at the Safari icon alone, for it's relative sophistication and complexity to anything on a computer before (only games had this level of attention to render), and then others like also mentioned here the Microsoft suite, I couldn't believe even M$ have managed killer icons showing up their own limited OS - creativity unleashed!
The second thing was, I hadn't felt this excited and happy about using a computer since my Amiga days, a sentiment also expressed here.
Apple needs to walk away from the current design-fetish to seeing macOS as a whole, a work of Art - that's the target IMHO and no less should be settled for, nor does it prohibit innovation.
Great Art is at its core the cutting edge of innovation and that is the platform Jobs delivered.