I can see where you're coming from, but I'd rather not see newer players be forced into draft mode if they wanted to play on the Twisted Treeline.
Here's how things tend to go for first time TT players - whether new to the game or just new to TT: 1) Get beaten by thing. 2) Declare thing broken as ****. 3) Lose to thing again. 4) Never play TT again for fear of playing against thing again.
With forced draft, they could go in and ban whatever beat them instead of giving up. Whether it's really overpowered or just pubstomp tier, it gives them the chance to see that the problem might just be how they're playing.