Melee Weapon Mastery stacking with other feats

[Quartz]

If the fighter "Needs it" it should be a fighter only feat.

I think he meant fighter as in combat-oriented class rather than Fighter as in the class.

 

[Legildur]

RAW aside, do you think it was intented to stack? I don't believe it.

I'm not sure it wasn't meant to stack..... Afterall, the morningstar is the only PHB weapon that deals two types of damage simultaneously. Would it be overpowering in this one example of a one-handed simple weapon?