Increased Autofill Protection for Support mains

So this has bothered me for some time now, why in the world do support mains get max 2 autofill protects?

So recently I had finished 20 some support games in a row and I wanted to just relax and play a few games of mid/top que before I went back to my main role, but my third game into the day I was autofilled to support...

If support mains do an extra part to help keep the autofill system from happening why aren't we given extra as a reward.

My idea is just raising the maximum autofill protections to 5-6, you'd still get 2 stacks of protection per playing support or fill in a game and it'd max out at 5 or 6 instead of 2 so you can take a break every once in a while as a support main.