The Genjutsu Dispeling is actually down by stopping the flow of CHAKRA. Therefore, WITHOUT chakra, one couldn't get out of the genjutsu. It's all about GREAT chakra CONTROL. If you keep this limited, people can die from Genjutsu. There are genjutsu that can kill.
Substitution is the effective way of dodging, even killing someone. Even it can be over used. But you can't just place a small limit on it. People should know that due to their rank and the rank of their technique, that it can only be used to a certain extent.
Same with Shushin, people should know their own limitations.
I just doesn't seem fair if you can't just trust people with basic limitations anymore, people just HAVE to put #'s on things....... Well, you can ignore me and say I'm wrong, or you can listen to me. Because this only my opinion, I clearyly cannot take action against the creator of these rules.