I think the more pertinent point is:What does M1 Ultra performance have to do with anything? The absolute cheapest model of M1 Ultra is $4k currently.
$4k buys you a PC which SMOKES M1 Ultra in 3D / AI / Adobe creative suite applications (single core performance is the only important thing with Adobe - because they don't care and didnt optimise their software). The only thing it *might* be faster in is 4K/8K encoding.
Does Apple care?
For the most part Apple believes that it is competing with its own products, not Windows products. As long as Apple's performance is "close enough", I don't think it matters. Who care if Windows is faster if the users want to own a Mac? There are tons of computer markets (at the low-end and at the high-end) that Apple doesn't even bother competing in.
If people on here want a Intel CPU and a 4090, go buy one. Be happy. Complaining on here isn't going to help.
If Apple gets TOO far behind in performance, that could be an issue. In the markets that matter (i.e. portable phones and portable computers), Apple's performance (where performance per watt matters) is really good.
If Apple can eventually ship a M* Quadra (even if it starts at $8000), that would also be close enough to a 4090 that most users just wouldn't care.