It's fundamentally a question of value.
It's also healthy for Apple to take criticism because that's the only way they ever change.
Intel got into trouble because it started taking its customers for granted, and thought they could just keep selling underperforming hardware for a premium, until one day they woke up and Apple had dropped them and people were buying AMD cpus in droves. There's no reason the same thing can't happen with Apple's pro users - and if that happens then they'll be taking their software with them.
What's the point of the transition if Apple is just going to take over Intel's position of resting on their laurels and releasing overpriced hardware that isn't competitive in the wider market?
I want Apple Silicon to succeed, and that means Apple need to be able to get new users into the Apple ecosystem. The importance of comparing the M1 Ultra with a 4090 is to point out the fact that as it stands today Apple is 100% unable to tempt people from PC into coming over to Mac.
Until Apple does what Intel did, this is just a thought exercise. Since the release of AS, it has been the best chip in terms of performance per watt, and it has been the fastest chip in Apple computers. It's still the same fallacy as before. It would be "cool" if Apple developed a 4090 level GPU, and if they wanted they could probably develop an even faster one. The question is, would it make sense for them to develop one? After M1, does anyone doubt that Apple cannot do a fast silicon, be it CPU or GPU, on their own?
There was a time when the fastest GPU in your Mac Pro really was immensely useful for the majority of things you did. That time is long gone and nowadays, 4090 level GPU's are only manufactured for AAA gamers, a small portion of 3D artists and cloud computing for A.I.
There was a time that the top of the line iMac had difficulties playing modern games at 15 fps. Today, even a M1 Max Laptop can play most games at 60 fps at reasonable settings.
I was a PowerMac + Mac Pro user for 20+ years. Then I switched to iMac, which was enough, and now I only use a MBP, which is enough. I can play many games in this laptop at really good framerates, which was impossible in all the previous MBP's I've used in the past, and I have always used the top of the line MBP's from the G4 to Intel times.