From information I’ve gleaned here and elsewhere, my 2020 27-inch Intel iMac will be supported with OS updates for another 2+ years. It was ridiculously over-specced when I put it into service 3 years ago, including 128GB RAM installed before it was even powered up.
It makes sense to me that Apple is moving away from this model, though. The built in Retina display still startles me on occasion with an especially clear or detailed image that draws me in. And I suspect that it will still be a great monitor once the internals are obsolete.
I connect this manufacturing move with Apple’s environmental commitments. Sure, there may be incremental improvements down the road in display technology. But when my 27 inch iMac goes, so does my current display, and my current display would be very satisfying to me for years to come.
I expect that my next major Mac purchase may be my last, or at least my next display purchase will be. It would be great at this point in my life to be able to swap out just a computer again.