I love losing ranked games due to the fact that players are allowed to first time champions in it.
Don't give me the "I first timed Zed in ranked and went 20/1 in it, carried my team, blah blah blah" shit. That doesn't apply to every single player in the entirety of the game. I just played a platinum MMR ranked game where THREE of my teammates have never fucking touched their champions that they played with. Of course, I make their Irelia go 0/7/1 in lane, but oh boy, My first time Draven and Vel'koz made Ezreal go a whopping 26/5. Taken, that was his final score, but he was around 9/2 in lane. He started getting more kills when he killed my first time Cassio over and over, where she ended up going 3/11. Thank god we cannot fucking impliment a system that PREVENTS players from locking in champions they've never played before.
In before the "Then players won't be able to trade in champion select" argument comes into play. The game is almost 9 years old, where they have billions of dollars to fuck around with. I'm sure they can think of something.