If you hadn't noticed they did vote against this and it was decided that votes are relatively unimportant compared to the power to control vote counting and deciding which crimes courts deign to notice.https://twitter.com/justinamash/status/1341203259277664260 …
It's never irrelevant because it shifts negotiating positions. Trump needs those people's support to remain in office and they have a price to extract. His BATNA is personally catastrophic; their BATNA isn't that bad.