It's 2020. Auto-fill needs to be removed from normals.
It often takes me over 30 minutes to get into a normal game, because I have to sit through a dozen lobbies being dodged at the last second. And then after spending those 30 minutes in lobbies, chances are I'm now also auto-filled.
If you have the choice between either spending 15-40 minutes in a role you don't even want to play, or waiting 5 minutes and likely getting into another game with a role you actually do want to play, taking the 5 minute cooldown is a no brainer.
The end result being that the vast majority of people dodge when they get auto-filled in normals, because there's no real penalty. The intended purpose of 'making games happen' when the role distribution isn't balanced isn't being fulfilled.
The feature is completely useless. This should have been realized and it should have been removed long ago.