Stats are this way for a reason, harm too. It's a legendary grade sword not equal to Muramasa. Masamune itself was the better half of the legends it all came from. Since it's the superior or the strongest of the two it makes sense treating it like a legend. Think about it this way. Masamune is what you get for offering Muramasa as a sacrifice for the epic task. Reason Masamune has no * in the name is the intent of it being a legendary grade weapon. Cause as it stands we got technically 3 boom stat like weapons, 3 spear like weapons, 2 axe like weapons. This isn't counting the gold counterparts ie: Ares, Dragon Spear, Janelle. Since this is meant to be a legendary weapon that isn't from the classic 3 it does get the same angles that the newer ones gotten but touched up. Please read the comments before your own I've answered all these questions before in the forum.
And when players want weapons they can choose boom variant, spear variant, axe variant, Ice cream, True Chick or Masamune. With any luck more weapons will be made too after this is released I'd like to not be the only one that had a weapon released O.o.