Game does NOT encourage learning new champs

The matchmaking system is too unfriendly when it comes to playing champions you're not experienced with. Let's take a look at the 3 main normal queue modes to figure out why: Blind - the system always assumes you're playing at your best, and with your best champion, and will put you against people who presumably are doing exactly that. So while you're playing x for the first time, the enemy team has 4 people on their main champs, using ts. That or they picked the most op champs available. Don't ever play blind pick if you want a fair match. Draft - same problems as blind but at least you can ban some op champs. But the game still assumes you're as good with all champions as you are with your main. Teambuilder - this should be the go-to queue to learn champs. But it failed. When you pick something new you're given a "matchmaking adjustment" which is supposed to put you against less experienced players. But does it really? I still see people in the enemy team playing their mains, and some are even higher elo than me. And even if that adjustment actually did something, it goes away after 5 (?) games - I'm expected to master a champ in 5 games? It's basically blind pick, so it still suffers from the same problems.

One day I made the "mistake" of spamming 1 champion (Ahri) in order to get really good at it. Thus, as I won more and more games, my MMR increased substantially, to the point that now, if I pick anything else, I'll just get stomped, because I'm nowhere near as good with that champion as I am with my main. If I want to have an enjoyable game and a decent chance at winning, I have to play my main. The game literally forces me to be a one trick pony. Do I have to play on a smurf to be able to learn champs?