They could have put a $700 mini in a $1600 monitor and it would only cost $400 more? Interesting.
The truth is now with the 4.5K 24 inch iMac it would be dumb for Apple to make a 27 inch iMac. Apples not going to clutter their lineup with similar sized devices with similar capabilities. The Mac Studio + Studio Display basically give you the 27 inch iMac with far more power and expandability.
A 5.5K 30 inch iMac or 6K 32 inch iMac make far more sense. But only question is whether they'd be too costly.
The previous 27" iMac started at $1800. A Mac Studio with Studio Display starts at $3600...