u/A-Random-Feeder

A weird question, but I want to know how exactly is this weighted.

So I am a mid lane main, and my secondary best is Support, so when I queue I pick Mid/Support. BUT from what I understand, the game will more likely throw me onto my secondary role, because Support is a really unwanted role to play. I'd assume it would throw me onto support 70% of the time.

Is this how it works? Or will it try to throw me on Mid lane when possible and there's no role weight or something?

I wanna ask what changed since then, like major mechanics, game rhythm or meta.

I was hard Xerath OTP, hit Platinum 4 back then and my duo was Warwick JG OTP. Then I got onto playing only Arams and Arena. Last time I played SR was 2 years ago.

Will I feel overwhelmed? I am too scared to go even Normal Draft SR rn