Hey! This is a great question.
As Xeliph called out elsewhere in the comments, this is partially to encourage queue health. If you had to exclusively farm a single behemoth for 100 hunts to max out their weapon, queues would get massively fragmented, and that problem would only get exacerbated as more behemoths were added to the game. Patrols are a balance against that.
Additionally, we think it would be somewhat fatiguing to fight a single behemoth 100 times in a row. We find that most people like a little more variety in their hunts.
We CERTAINLY want to make sure you've fought a Behemoth a bunch in order to build and max their gear. The whole premise of the game is building gear out of the parts of behemoths you've slain. We picked several keystone levels (+1, +6, +10) to require a variety of parts to make sure you've beaten the behemoth a number of times at each threshold of difficulty.
Maybe the balance is off? Perhaps we should require some par...
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