dragging monsters across the battlefield up and down with a single fly
removing retaliation
Even chains weren't originally planned by NWC.
Experts on the interportal, provide the rules for other resources! I only know about HP; it's the same there. In my opinion, the only real argument for changing the rule is the imbalance among players with different rules.
Oldboy, it's bad that victory sometimes goes to the "wrong" player due to a mistake, but you can't write down everything in the rules.