Iksar, thanks for this response! I definitely understand where you're coming from, but as a person who just so happens to prefer slow, grindy control decks and exactly mill decks (your other example), I think I would just reply that "oh you can play it, it will just be very bad and have a 38% win rate" isn't much better than saying "it doesn't exist."
I converted from Magic because I was already invested in Blizzard games and because I wanted to play with friends, and my deck preferences in MtG were mill decks and mono-blue control styles. I had long ago given up hope that mill decks would be meaningfully viable in Hearthstone, but with this phrasing, it feels like both of the archetypes I prefer will just not be viable going forward, and I gotta say, that feels super bad. I'm not sure that you can (or should) do anything about it, but I did want to add my voice to say that I don't feel included in the plans you're laying out, here.