You're not getting it. You can be fired for performance irregardless of seniority, but they will have to at least prove it, can't just say "you're fired because I say so."
If you don't work hard here you will have a rough time as your slacking falls on other people to pickup and they WILL call you out for it and then undermine you.
What if you claim the "performance goals" are "unsafe work conditions"?
I see what you're getting at. Are there ways to game the system? Yeah... but the door swings both ways. I think we all can generally tell the difference between good working conditions and unsafe ones.... and who is a good worker and who isn't. Also don't blame the rank and file (union or not) for the problems management creates--- like who they choose to promote. Sheesh, but that's a whole other topic. -- "Fascism should more properly be called corporatism because it is the merger of state and corporate power." -- Benito Mussolini