Talk:Riven Mods/@comment-50.106.19.15-20170530163620/@comment-68.13.166.27-20170606051422

The way I see it, disposition as a measure of "how often players use this weapon" is more of a "how powerful is this weapon" indicator. Rivens as a system are merely a band-aid to the weapon balancing issue present in Warframe. Plus, players that can afford a great Riven or have the patience to reroll for one are much lower than the percentage of players who just use a weapon because it stands on it's own.

I say the following without evidence, but I imagine DE can see which weapons are equipped with a Riven and which are not, and disposition is most likely based off the non-Riven usage numbers.