Couple reasons.
The first has to do with how behemoth-specific weapons funnel players to specific content. If you want a Koshai Axe or Koshai armour, you have to fight a lot of Koshais. If you don't LOVE fighting Koshai, that gets old, real quick. If you could work toward that same goal, but had many different Behemoths that all contributed toward your progress -- you are more free to choose game modes and encounters that are fun.
The second has to do with creating weapons that are more unique in their playstyle. Right now, all of the blaze swords, for example, are pretty similar. We've started to try and differentiate with things like Phaelanx, but as we add more Behemoths - weapons either are "best" or "not best". Having weapons with stronger unique identities, kits, and playstyles lets each shine in a different situation. To do that, we want multiple behemoths feeding into a single weapon.
All of that said, there are places where specific behemoths/beh...
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