If you Que for Mid primary and Top secondary
There is a 75% chance you get top, why
There is a 75% chance you get top, why
Because more people want mid than top. In order to keep queue times reasonable, you're shifted towards your secondary role.
I refuse, I want a button that makes the matchmaker take a bit longer so I can get my primary.
But adding that in as an option increases EVERYBODY'S queue times, even those who choose not to opt into the longer queue. This isn't some spiteful group of employees trying to make you sad, it's an algorithm that says that this is irrefutably the most efficient way to get people into games.