Disconnections in Ranked

Someone please explain to me, that, when in ranked, you would ever lose any points if someone on your team DC’d.

Cause there is no way of preventing players from abusing this. They would take turns just leaving group so there buddies would not lose points.

Easy solution to this: if a person in a party disconnects or leaves, all of the party members are penalized as though they left the game. All team members who weren’t in the leaver’s party don’t lose any ranked points.