You may think you can do without a union if business is good and management OK. When shit hits the fan, that is when you'll learn that you need them.
I work in a German unionized company and I think unions can be quite well-aligned with workers and business interest.
IIRC certain aspects of US law make unions be the way they are in the US on purpose to lower their acceptance among employees. For example work councils which are commonly established in unionized companies aren't allowed in the US iirc, they can be a nice alternative from going all in into unionizing, a democratic representation of all employees.
I work in a German unionized company and I think unions can be quite well-aligned with workers and business interest.
IIRC certain aspects of US law make unions be the way they are in the US on purpose to lower their acceptance among employees. For example work councils which are commonly established in unionized companies aren't allowed in the US iirc, they can be a nice alternative from going all in into unionizing, a democratic representation of all employees.