i agree with your OP, and this part about “solving” difficult MH lobbies like a puzzle. when RQ MH was announced, people kept saying “thank god it’ll stop steamrolls”, but my MH matches go 2-3, 4-5, overtime nailbiters more often than anything in RQ QP.
i do disagree about backfill, if only because i find it really satisfying to backfill into a losing MH game and turn it around.