We're not even talking direct democracy, here. The parent post is saying (for example) that a single Senator can prevent a bill from entering the Senate, even if said bill would get a majority of Senate votes.
If it was possible to get such bills put to a vote over the objections of singular individual representatives, then there would be less need for direct democracy.
If it was possible to get such bills put to a vote over the objections of singular individual representatives, then there would be less need for direct democracy.