What is the point of Auto fill? (I has only cons).

I was always wondering what was the point of Auto Fill, because I play other competitive games there are no needs in "Auto Fill" (getting the role you don't want). It only lowers the satisfaction from game by giving you other role. In LOL it only saves the time for queue, but is it worth a trolling bot lane and wasting -+ 40 minutes in game?! Of course it isn't. Every one prefers waiting for 5 minutes then getting the wrong role. It is insufficient and unsatisfying, many games are tolled and lost. I hope riot will take this into consideration, because it is better waiting for 5 minutes in queue then having a bad game. There is no serious reason in having Auto fill. Only because Riot wants players to star playing faster i think. PLS Disable AUTO FILL I beg RIOT