It is the central thesis of unions; unions represent workers, not the product. When you do more for workers (ie making it harder to let them go, striking, increasing benefits, etc) this comes at the cost of the product.
But that's just a thought experiment. There's also a mountain of evidence showing unions hurt the product (here's a study on increased recalls with higher union participation: https://dl.acm.org/doi/10.1287/mnsc.2021.4082) and that they hurt innovation (here's a study on innovation, showing a reduction in patent quality https://scholarworks.utrgv.edu/cgi/viewcontent.cgi?article=1...). Unions care about workers at the expense of product, management cares about product at the expense of workers. They are at opposite ends.
But that's just a thought experiment. There's also a mountain of evidence showing unions hurt the product (here's a study on increased recalls with higher union participation: https://dl.acm.org/doi/10.1287/mnsc.2021.4082) and that they hurt innovation (here's a study on innovation, showing a reduction in patent quality https://scholarworks.utrgv.edu/cgi/viewcontent.cgi?article=1...). Unions care about workers at the expense of product, management cares about product at the expense of workers. They are at opposite ends.