There is no reason (note: a reason and a cause are two entirely different things) for mechs to remain "engaged" past the end of the match. Once the match is over, people hanging around to look at their stats or chat shouldn't hold up the rest of the players who have disconnected.
Arguments of "this isn't important enough to fix - they should fix X instead" are spouted by people with a very shallow understanding of how a development team works.
Edited by PhDGreg, 06 February 2013 - 08:30 AM.