Different sort of planned obsolescence.Have to admit I find it ROFL amusing to claim the Apple Studio Display is an example of "planned obsolesce" considering it (in part) replaces the iMac 5K which, as an AIO, required you to toss the entire machine every time it came time to upgrade any component.
I got an iMac in 2017 - reluctantly because of the "toss the screen" issue you mention. Which is serious - but was countered by the fact that getting a screen of that quality bundled with the 2017 iMac was a darned good deal. (c.f. the price of getting, say, a Mini plus an LG Ultrafine...)
However, I've had 5 years of use out of it and it's still an excellent screen, there isn't much around today that's better and I'm still in 2 minds over whether I need to "upgrade". At the moment, that's actually reducing Apple's chances of selling me a Mac Studio this year...
Plus, it won't be "tossed" - I could BootCamp it (and not bother with trying to run Windows on Apple Silicon), keep it for running old 32 bit Apps, use it as a second display with Luna or something... I guess second hand prices are going to hold up with the total demise of the 5k iMac, too.
Problem with this new display - it sounds like pretty much the same panel as the iMac display, which is now 5 years closer to obsolescence than when it showed up in the iMac. As soon as MiniLED models appear (even 4k ones) it's going to be highly undesirable.
...plus, it's strictly USB-C only.
Mainly, though, it's the price - just to repeat what some people really don't seem to want to hear for just $200 more you used to be able to get a fully functioning iMac with a comparable display and decent speakers, mic and webcam. Now, that doesn't even pay for the proper stand.