Remember in the 2000s when we got updates to the Mac Pro/Powermac twice a year ? Everyone was pretty happy with that...
2013-2023 appears to be a drop in demand for the Mac Pro as non-tower Macs were fast enough, laptops were preferred and those buying could care less about PCIe slots. This is why refreshes were lengthened beyond a year.
2013 Mac Pro is the grand experiment of ditching PCIe slots based on how 2006-2012(?) Mac Pros were being deployed.
2017 iMac Pro was supposed to be a stop gap until the 2019 Mac Pro with the return of PCIe slots.
Frankly I do not think any Mac Pro user from 2013-2023 would mind a return of the pre-trashcan tower design if they would mean annual freshes again.
Seeming there was a sizeable appreciation of the 2013 Mac Pro & 2017 iMac Pro then a 2021 Mac Studio was created.
The Studio is what the Cube and trashcan and iMac Pro should have been. It is so popular that it was refreshed less than 1.3 years later unlike the Mac Pro of the past decade.
Although I find it unfortunate that entry level 2023 Mac Pro increased from $6k to $7k from its 2019 SKU. I see it being caused by the reduction of the economies of scale of that product line as almost everyone prefers the Mac Studio.
If a 2002 Mac Studio were sold at $1,700+ back then using the same G4 chips as a $2,999 Power Mac tower I'd go with the PCI-less Mac.
I do not want to subside other people on things I'd never use. 2023 Mac Pro's $1k hike is the removal of that aid.