The grip fighting is a DIRECT and entirely foreseeable result of the ban on leg attacks.
It used to be possible to attack an opponent with morote gari or kuchiki taoshi if he/she refused to grip. Frequently by feinting an attempt to grip and dropping under the hands reacting to block and reaping the legs.
There was always grip fighting but the rule change made it worse. All that said, I don't think it's reasonable to think that two closely matched elite competitors will allow each other any kind of advantage that might lead to a loss. They are there to win, not get thrown for ippon so the fans can cheer. Nor is it reasonable to expect them to not "game" the rules, whatever they might be.