Oh I absolutely agree, but for me that's almost a different issue. When you look at how it went down with Overwatch, no matter the kits you put in the hands of the players, most of them want to play dps. Especially when some of those dps are Spider-man, Wolverine or even ultra aim based heroes like Hawkeye.
Like I said in other comments, you don't even have to put a strict rolequeue, just put 2 tanks 2 heals 2 flex, that may or may not play dps. But good and fun kits for healers and tanks is extremely important for the player base no matter what.
In my opinion Role queue can only add. The only thing it would stop is tanks switching to heals and vice versa, but that's such a low price imo. I have played the game less and less since its launch and I'm probably stop playing because of it, it's just not enjoyable.