Sure, that fixes one problem, but what about fast loans back and forth between large holders?
Discussion
You would see it on chain
You would see something on chain but not it could be made quite murky with coinjoins or payjoins or any number of clever and cheap techniques. Also you would have to know with certainty who owned the UTXO it came from. Otherwise they would of course just say it was there and they were consolidating
Psudonimity is pretty powerful