I believe, any process where "vote count" is the "only" way to decide the winners, appropriate canvassing policy should be a behavioral guideline.

On the contrary, I believe that in actual votes, in contrast to our regular consensus seeking processes onwiki, campaigning should be explicitly encouraged. That being said, behavioral guidelines could still apply on certain channels, but getting votes by talking about your platform and what you want to achieve if you win should not be disallowed in general.