Related (but not duplicate): The association bonus should not enable users to vote on every site
Recently, I have been considering voting on site-specific meta discussions (not meta.SE or main sites). Anyone with the account association bonus can upvote on these discussions, regardless of how much they have contributed to the site. You could register a new account, vote, and never log into the main site.
It seems this misrepresents voting on meta sites. Drive by voting can be only be positive, which is problematic since site metas are where site policy and overall site opinion is generated and documented.
In my opinion, the goal of meta sites should be to get opinions from users who are invested in the site. Not just anyone on the network.
Anyone with an account association bonus can artificially impact this. This is not ideal because a site meta being used to determine site scope should be defined by users of the site: not by anyone.
My suggestion is to prevent the account association bonus from allowing voting on site metas. This will mean site metas better reflect the opinions and perspective of users who are actually invested in those sites.