Heh, that reminds me of when a friend of mine invited me over to show-off his hand-restored Mac (early-1990s-ish - I think it was a Performa 520 or 575?) and despite the lack of double-buffered graphics there were hardly any painting artifacts but the most striking thing was just how smooth and responsive everything felt - obviously the fact it's a CRT helps a lot.
When the world moved away from computer CRTs to TFTs we also went from 70-85Hz to 60Hz everywhere - and I swear I definitely can "feel" 60Hz vs. 85Hz - so I'm looking forward to monitors gradually shifting towards 120Hz or 144Hz (or higher?) because that definitely helps with responsiveness and snappiness, even with double-buffering and desktop composition.
The Mac pro is just a Mac studio with a "PCI express expansion chassis" bolted on which is of no use to most people. The price says Apple doesn't want to sell a lot of those machines, they probably only fitted a M2 CPU in an old Mac pro chassis to tick off the 'entire range migrated to Apple silicon' promise.
But... the UX on PowerMac G5 is lot more pleasant and everything feels lot more responsive than on modern Pros. Probably because of lack of signature verifications, SIP, RPC with Apple servers. But still, those machines _feel_ better.