why isn’t their a massive push to get other assembly line workers pay and benefits equal to those of auto? they get all the headlines, money, and support. why is that?

Union members spend time and their own money organizing. When they fight it garners headlines. Those headlines 8ncrease public support because when they win it lifts local economies while increasing other labor fights chance of success.

The industry standards are set by union shops, the pay at other manufacturers would be significantly less if unions hadn’t pushed to get their members good contracts. The massive push you are questioning has to come internally from workers at non-union shops ready to start organizing themselves.