Why do i get 2-3 fills every game?

Even in diamond 5-4 i get people playing a role that is not his primary, trying champs, and first timing some role like jungle, being a adc main, like what the hell guys, just play one, or max two roles, why do ppl have to try new things in ranked, in medium-high elo?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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