The biggest reason I miss Team Builder
I really really miss off-meta things. If I wanted to play a game and go Braum top, just for fun, I could queue up for it and the people who would see it would ether accept it, or say no. If I wanted to go mid Soraka just for fun, I could. If I wanted to ask if someone wanted to do Singed/Cass bot lane, they'd ether be all for it, or not.
However, now, even if i'm playing a normal queue, I often will feel guilty if I'm playing something extremely off-meta. Not to mention, people take Normal Queue super seriously and will often flame you for even trying to pick something off-meta. If I wanted to practice Rumble Jungle, chances are I won't even be able to grab jungle :<
I miss Team builder... a lot ; ~;