I don’t think there’s any configuration of the Mac Studio and Studio Display which is not significantly more expensive than a comparably specced 27” iMac would have been. Perhaps not “three times” as much, but it’s definitely a price hike.
Yes, it’s likely significantly faster spec-for-spec because of Apple silicon, but there is now a pretty substantial gap for mid-range Macs (the so-called “prosumers”) with the discontinuation of the higher-end Intel Mac mini and 27” iMac.
For example, you can’t currently spec a Mac with 32 GB RAM without spending $2,000. That certainly wasn’t the case before.
Edit: Turns out that high-end Intel Mac mini is still for sale. Hmm.