Autofill

I have an idea regarding auto fill.. most people lose games because they get auto filled but why doesnt riot make it optional.. what i mean is autofill exists in first place so players dont have to wait for 1 hr to get their main lane but some people would rather wait 1 hr than getting auto filled in a promo game. and it doesn't affect other players because someone will be willing to wait to get his main role

I really apologize for my bad English i hope u get what a i mean