Traces: hostilility to centralization. There's no way to "hack" a vote by controlling the voting mechanism because there is no voting mechanism. To corrupt the signal, you'd have to corrupt the traces themselves. The integrity lives in the distributed data, not in the aggregation logic.
Zaps! yeah, that is a huge signal. It is still a challenge to catch the real people who just got on Nostr and interact less than others so they don't connect with people. They just end up leaving... sometimes.
Getting polls was a first step to some consensus agency, in my view. A work flow around it with more functionality is what I view as second. Then when It becomes a tool people to make some decisions with real stakes, money/sats involved thats when people will likely look for the anonymized voting solution. Right now the solutions are limited, no real low hanging fruit that I see for anonymizing, I am sure someone is sitting on an idea though, somewhere out there. lol