I find that a bit limiting, I would rather hear people's opinions even if they might be subject to bias. And I don't think that an opinion based on personal ex

I find that a bit limiting, I would rather hear people's opinions even if they might be subject to bias. And I don't think that an opinion based on personal experience is "only personal biases and assumptions". It is also important that your approach be uniformly enforced: you would have to encourage people to refrain from saying that FP programmers have the same skill level as non-FP programmers, since that opinion is also not based on any evidence.