I feel confident in saying that the only reason the polls are there is to have the players think they're listening. We've all heard the phrase "Gathering some data" spoken in relation to Valve for so long that I don't believe they're actually doing anything with the results.
They've done it before. Remember when they implemented that system where you'd get a notification if someone got banned for getting reported? I don't know if people even get those notifications any more, but I feel like that system was implemented solely so people think the TF team are listening.