Likewise, the fact that corporations act as proxies in some ways doesn't mean that they must act as proxies for votes.

Obviously, the court has ruled that they do in fact act that way. But we're talking about what should be, not what is.

The question of whether corporate owners of residences should be able to vote in this town is not at all obvious, certainly doesn't merit dismissal with a glib "corporations are just proxies." They aren't just proxies. In some respects they are, in others they aren't. If they were nothing but proxies then there'd be no point to them.