Also - I think the iMac changed how some people see the cost of the display in the computer's price. I can respect why people would include it, and if they are moving from an iMac many will likely add one on without considering other options. For me, after being burned by a previous iMac I am super excited to see so many headless Macs that allow me to use any monitor I want.
I'm right there with you. Just days ago my most important computer's tech guts went on the fritz. That's iMac 27" It's best monitor, best Mac and best Windows computer "all in one." Guts start failing and I lose ALL of "them."
No matter what iMac "bigger" option Apple could have rolled out at this event, I was committed to NOT buying another iMac. They are great values at the beginning but then it's "throw everything away at the end" including a perfectly good screen that would probably have 5-6+ years left in it if there was some way to keep using it.
So I was 100% ready to lay out big cash for the rumored Mac Mini with M1 MAX. Instead, Apple doesn't show that one (yet?) and I need a new main Mac ASAP. So Studio won my money... and more than I expected to spend for super Mini.
What about Windows? That will be bootcamp the old fashioned way: a separate Mac Mini-like PC.
What about the monitor? Apples monitor looks great but too locked down and inflexible for my purposes in trying to basically replace all 3 things I've lost. So I went ULTRA-WIDE with multiple inputs (full KVM actually) to be the monitor for both Studio and PC, even at the same time (split screen) with TWO more inputs to spare. Built in KVM means one keyboard, mouse, speaker covers both computers too.
As offered, plenty of fish in the sea for monitors. Look around. There's far more options than either Apple 27" or Apple $6K: all sizes, all shapes, all kinds of jack options, flexility like that KVM "hub", etc. Yes, the main thing I look at with my new Mac will be somebody eles's monitor brand.
But so what? Think what would have happened if Apple would have NOT released a new monitor at the event. EVERYONE would be thinking third-party monitor to pair with whatever new Mac they may have purchased (if they did not already have a separate monitor). Just because Apple rolled out one that is much less than $6K doesn't mean its the only possible choice for all of us Mac people. It's just ONE, albeit very nice choice.
I look forward to having a Mac working on a BIG screen again, hopefully as soon as this coming FRIDAY. And when Studio guts are dying or macOS updates are "long in tooth"ing it, I don't have to throw out a perfectly fine screen again.