Addendum to my previous post about why the rank gap limit is a bad idea:
https://www.youtube.com/watch?v=BGytrJSSi6k"Already, after only a couple of days of testing on the PTR, support players are reporting being outleveled by their teammates, to the point of not being able to play with them. It's so severe that in some cases, after playing the ten placement matches all together as a single team, the support players by the end of it will be low enough that they can no longer queue with the rest of the team"
This is exactly what I said was going to happen. I realize it's PTR, but blizzard should have been able to predict this