I agree on the importance of anonymity for social discourse. But if a tool/platform like Polis is some equivalent of a local 'town hall meeting', where there is

I agree on the importance of anonymity for social discourse. But if a tool/platform like Polis is some equivalent of a local 'town hall meeting', where there is no anonymity (and you as a citizen publicly appear, state your name, make your argument, etc), then why is lack of anonymity a threat in this specific context?