Performative radicalism that freaks out wider society instead of slow steady progress has led to the near complete irrelevance of the left in the west, especially the anglosphere. I mean, UK Labor is a centrist pro-capital party now. It's over.
The biggest issue of most "performative", as you call it, left wing movements is the lack of direct experience with everyday politics. Real-world politics are extremely messy, often in direct conflict with our ideals. Stuff like, How far you can push your message, how far can you pull the strings of the people and the institutions around you.
Those workers have a very good understanding of working both with strong forces and delicate equilibriums (...equilibria?). Both in their everyday work and their contractual situation. Otherwise people die, for real. They knew exactly what they were doing to get their end goals.
I see the same approach in people like Alexandria Ocasio-Cortez. Interestingly enough, she has too a working class background in a field where power balance is paramount. On the other hand I can't think of a single well-known British Labour politician who shares the same.