Gist version being missed:
Make leveling roulette help people leveling. Don't not do that by making a group with all 70s. Next, bring us 70s down to the person's 40 range. Don't drag the 70s and the 40 into a Sastasha.

My perspective: I'm a tank. I make your queues faster. Couldn't care less if it's Sastasha, Quarn, Vigil etc. I would prefer to actually help people then drag people through a slog.