In my (personal) opinion, letting trusted admins have access to private voting data is not nearly as much of a concern as having data harvesting companies scrape users' public voting sentiments for selling and profiling. The possibility of user stalking is also not great; if votes are fine being public, why don't we add links to every comment showing which users voted which way, and add links to every user profile showing a list of their votes? There already exists a site that can show public voting data, and if the threadiverse is intended to become a large platform, there will quickly be a userscript that adds this functionality. It feels to me like private voting is a positive goal, and trying to retroactively think of reasons why we don't care about it just because no one's thought of a good way to do it yet seems like sour grapes. IMO I'm okay with understanding that it's a hard problem that may need more brainstorming on a better solution for the future, but I feel like completely giving up on it is bad.