Is there any reason why games still start when not all players connect?

Seriously, is there ONE good reason why games can start when people don't connect during the load screen? Or if they disconnect during champ select?

Is it because of the "potential of being abused" ? How about at least lowering the surrender timer or at least not losing LP for a game that never starts with an even playing ground? Anything. I don't want to hear statistics of how "mismatched teams manage to win 14% of games from behind!" or some shit. I just want to play a fair 5 on 5 from the beginning of the game or at least not get penalized for not having a complete team while we have to waste 20 minutes getting pushed in and losing. C'mon now, how long has this game been out?