So you are saying you punching something with your fists, should do more damage than someone using a giant spear and destroying an enemy. I still have issues with monk multi-hit Weapon skills doing more than Rampage or Decimation in FF11. I would highly disagree that a punch attack should ever do more than a spear attack. But I wouldn't be against the idea of maybe after using Simian Thrash, that maybe the pugilist's Stamina usage is decreased by 1/2 for 15 seconds after using it.

*Edited for spelling and capitalization errors*