Hello ck, i totally agree with the Sub 1sat/vB transaction discussion.
But maybe you can include sub-1sat/vb that are beneficial for the UTXO set.
We can clean it up if there is some free space in the block.
If input>2xoutput for example
It's not a bad idea but there's no provision for such a thing in the bitcoin node at present and it would have to be coded up.