Changes to Team-Builder level requirement

What the hell was Rito thinking?

All of the new people under 25 are now often forced to play roles that they are inexperienced in and sometimes terrible at. Does this make the game enjoyable for anyone, apart from the other team who feeds off of the inexperience?

I have a friend who is trying League out. He's very new, but he likes the game a great deal. We used to play team-builder frequently, but now that option is unavailable and we are forced to blind-pick. Let me just say, the amount of people who insta-lock and refuse to communicate about roles is astounding. They basically just gave every sub-25 the troll poll by empowering trolls, thereby punishing people who take the time to communicate.

I just searched and found that they also implemented this non-sense around the same time last year, with the result being the exact same complaints. Did we ever even get a reason Riot gave a level 25 requirement to use team-builder for normals? How long did it last?