Riot find a way to reduce number of fail games with Team Builder. team builder let you chose your position and role that you prefer to play so no more “told 1st” and teams with 2 top lane and no support.
How does it work?
At beginning you chose position (top, mid, jungle, bot) then you choose your role (assassin, fighter, mage, marksman, support and tank) that is information that will show to rest of team. If you have 2 assassin’s in your team you can just change one of assassins for tank for example.
This is good for solo players that did’t decide just to play one role in game and want to change it several times a day, all you need to do in change you settings and find team that can use your skills in that role. Small things like this show that Riot take care of people that play this game and that they want to improve your game experience and to make it more enjoyable for everyone.