wanderer ox and strat are midrange decks tho, just because it is a trial doesn’t mean it isn’t midrange, also not sure how you got 7/21 to be over half, but oh well. as for eggs and decispikes, they are midrange decks that finish with a burst when you get to lategame, just like dragall’s midrange reva would finish with a spiral. swarm is played much less aggro than it used to be, with things like wriathcrown making the deck much slower. half of the decks on that list are non-trial midrange. as for what a midrange deck is that is really up for debate, but I would say that it is a deck with a flexible gamplan that will change what it is doing depending on the matchup and is neither fast nor slow.
as for “half the generals being left with nothing” (it was 6/18 btw, you really need to work on your fractions here) that is due to one of vanar being bad, or there being better in faction generals. I don’t see how it proves your point at all, given that most of the decks are midrange, even after imposing nonsensical restrictions.
I also have no idea where you are getting this idea that you need to kill by 6 mana in order to be viable, I have won many games with midrange far past that point in this meta.