Yes, agree, although when you get to the higher levels of the game this isn't too much of a problem due to most teams being active, but when facing illegal formations inparticular, you should win by default, inactive sides playing regular formations should begin to struggle after a while after players lose morale but because they play normal formations they can sometimes get a result against 10-15 quality teams better but this is uncommon, I've often seen the worst abandoned teams struggle in the league all season not picking up that many points, There was 3 seasons I played, I think it was L10,L11 & L12 where the bottom abandoned team all finished with 0-0-26 with 0 points and conceded well over 100 goals each.

The problem is with abandoned teams is that after a few seasons players contracts expire and the system generates old 3* replacement players for the squad.