No goalposts were moved. I questioned the premise of OP's comment on whether unions can exist in a world where employees choose to switch jobs every 2-3 years.

No goalposts were moved. I questioned the premise of OP's comment on whether unions can exist in a world where employees choose to switch jobs every 2-3 years. You responded with an authoritative answer backed up with zero evidence or supporting data. That it was about unions is an embedded assumption based on that fact that the entire discussion is about unions.