While I do enjoy missions, especially the "use a keystone from these trees" mission since I'm mostly aram only so I saw/did some pretty interesting things, I will agree trying to force others to do certain quests is bad.
I despise ranked, refuse to do it at all. I like to play casually, my first 2 seasons of ranked showed me that yeah, ranked isn't for me at all. And this quest is just... why? I can only play a few roles, however most often I support and while that may be a normally unliked role, I'm not guaranteed to get it. Plus I'm mostly an aram-only player.
Sure, I can easily go from howling abyss to summoners rift more easily than others, but that doesn't mean everyone can. And not everyone can stand the competitive nature that is ranked. I sure can't, and one of my friends hates ranked but plays for gold because he wants the end of year rewards.
It's like the pre-made missions... most people can't do them. But, like we'll soon see here, if you complain you get told to "suck it up" or "get some friends" by some jerks, even if theirs a bunch that agree with you.