> It's not that simple. As a miner, if i have less than 1vMB of
transactions in my mempool. I don't want a 10sats/vb transaction paying
100000sats by a 100sats/vb transaction paying only 10000sats.

I don't understand why the "<1vMB in the mempool" case is even worth
consideration because the miner will just include the entire mempool in the
next block regardless of feerate.