i mean if you are only caring about full nodes, size of utxo set doesnt have to matter based on the bitcoin node implementation. you dont have to store it separately, you can just point to the tx and the output you are spending.
also we are already gonna make the bitcoin divide into more units at some point (i know LN already does). but also this one is being centralized kind of an issue.
i was just saying it was a nice quirk that helped, i was kinda thinking about how blocks are gonna become more and more empty as the bitcoin price rises more.