A “UTXO moving” are your words not mine.

It can be obvious what input(s) led to the creation of a UTXO. If someone is sentimental about one of those inputs and it affects their behavior, that’s pretty hard to stop.

And clearly, people can come up with whatever arbitrary system they’d like (FIFO), to play games they want to play. If they understand it’s a collective hallucination that only has relevance so long as other players keep playing, then I don’t see the problem. There are many communities that invent parameters for games or collectibles that amount to “let’s agree to pretend such and such matters.”