No reason... I think they had to add weight... so.. somebody thought that this was the best place for it... just NOT the approved location for corrector weights. I think it is just the culture of sailing these days... Push the rules... wait for the protest... deal with the consequences.
If given three choices... Cheating, Stupidity, or Sabotage...
I vote stupidity..A culture that agrees.. this is a trivial rule, it won't make a difference in performance. Therefore... Push it.