Thanks for it, and I have some input. When this was just an idea back in 2008, the idea was for the debate to have an open poll just like what you've suggested here. I agree that it would encourage a lot more participation, but here's why it wasn't put in the initial idea explanation right off:
Result without the obligatory/needed explanation. With a simple poll, there's nothing that says I actually read the debate. I could've just looked at two names, and voted for the one I typically agree with, like, or share a social group with. Specific judges offers the requirement that people actually have to explain their vote... possibly via a point system or lengthy explanation. I do understand what you're saying, but having an open poll would only further frustrate the already irritated idea of bias in judging.