Couldn't agree more (and would also like to add the idea for harsher punishment for leaving (debatable)).
Despite the fact that it's out of your reach, Arma, low lvl battlefields suffer daily because of that crap. From smallest to biggest, CCs tend to be really bad nowadays (9 vs 4/5, and similar). CCs and occasional Temples MAY start with both teams on max (happens every month or three), but it's gonna be a surprise if nobody leaves.
Buuut, they often won't start with full number of players. Just like previously mentioned, CCs usually aren't 9 vs 9 AS THEY SHOULD BE - either players don't accept or leave (often both).
Because of that battlefields aren't fun or challenging as much as they should be.
An easy win when you need it and come with fully prepared group (or solo (depending on the battlefield))? - No problem, AT ALL!
*Note: Possible exaggeration that isn't far away from the truth.