I see your point here too... kind of a no-win situation imo. If the overlay is hidden in panth, you end people trying to get into AI only matches (or mitigate against it some degree) or trying to stack a team. Excellent counter point though.
Well I mean don't get me wrong, you're absolutely right. I shouldn't be picking and choosing partners for any reason when it comes down to it. If I weren't so impatient that I tab out every time I wait for a game to start I would actually be quite picky for unacceptable reasons, like there were some games today in which my partners absolutely refused to speak the entire game, they would wander off mid-fight, etc. and I would avoid playing with those people, which is gaming the system and bad for matching in general.
So logically I think you're right, but on a personal enjoyment level I prefer it how it is... but I haven't gotten burned so far by people dropping queue half a dozen time in a row, so if that happens I'll probably change my mind again.