Isn't 5v5 targeted towards Role Queue?

Will find the post which referenced this and link it here.

Yep. I did look around and find this quote in the meantime.

Just like you don’t question the validity of the devs’ quotes praising Open Queue in the Arcade after such a short time of testing, I don’t want you questioning the usage statistics, along with official developer quotes such as this one:

Which, along with almost all unofficial polls carried out, prove RQ as being the preferred Competitive game mode.