"Without voting secrecy, I'd say that building a robust system would work reasonably well. With voting secrecy, it's a different story. "

Sadly this is true and I agree to that. I am also a fan of open voting, but I can see that general society is not ready for that.

And to your other points I mainly agree, but I am a bit more optimistic, than one can build a system of open trust, even though I have to admit, that I also do not understand the specific system, but I also did not really look into it.