There's no particular reason why filibusters should be banned just for nomination votes, and there's certainly no justification for doing so in a way that violates the Senate's rules.
Maybe the reason why filibusters should be banned just for nomination votes is that the Constitution requires that the Senate advise and consent. Ignoring a nomination is unconstitutional.
Doing exactly what Senator Robert KKK. Byrd, CSA, did FOUR TIMES cannot honestly be called a violation of Senate rules.