Grades with Assassin junglers

So I've already noticed that the grading system kinda values farm over kills - but isn't that stupid with champions like Kha'Zix who a) don't have much farm anyways because they're junglers and b) are trying to snowball a lead instead of farming a lot of the time? I had some insane Kha games (where I actually carried), for instance one where I went 21/3 and those are the types of games I get a B on I feel like I'd get a lot of S when I'd just afk farm but that's not what you're supposed to do with him most of the time. So is that true? Do you really just need to farm instead of ganking when you're trying to get mastery 6/7 on those champs?
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