Sorry, I had to bite on this one. Your point makes a lot of sense on first glace but I think you're really making a false equivalency here.
You're basically saying that: because players in Quick Draft (aggressively raredraft) then bots must also (aggressively raredraft) otherwise (bad play pattern) people will be facing off with bizarro world 6-8 rare decks.
But actually- there's nothing to stop players from doing this in Premiere Draft either. There are still only 8 rares opened at the table- it's not as if they're magically all on-color bombs. If you rare-draft every pack, what you're getting is a pile of off-color Rares, duds and Constructed cards. All this does is make your deck bad. You'll get cleaned up by players that actually know how to Draft, just like you would in any other draft.
The only reason players would want to take these off-color, 'bad' rares, is to game the fifth-copy-protection in packs as a strategy toward set co...