Banning Off Meta Champions

I have been playing a lot of Akali lately and last game I got jungle and decided to play her there (yes, I have tried it before). I showed my team that I was going to play her and she immediately got banned by my own teammate probably because it is "off meta". I picked her just because we needed more ap damage. I feel like this is not the purpose of a ban phase as it should be used to prevent strong champions, lane counters, or team comp counters from appearing on the enemy team. It is not like a random bard ban to prevent ult trolls... they can clearly see who you are going to play and ban accordingly. I understand that RIOT preventing the banning of champions that have been shown by an ally could result in some issues(ex. someone shows a champ that they really don't want to play just because they feel like it and now it can't get banned), but I feel like it is really difficult to bring an off meta champion into the game now that 4 other teammates have the choice of preventing it.

TL;DR - I don't think people should have the power to prevent others on their OWN team from playing the champion that they want.

Thanks, Ap2626