Which is the problem with all-powerful unions. Works great when you have a booming industrial city like Detroit. But accelerates a downturn in bad times or decelerates potential boom times, negatively affecting the wider economy outside of the union.

In downturns those lucky enough to have a union job cling on to them and continue to push for more power, creating a secondary class system within the working class benefiting a portion of the populace while simultaneously making their company far less competitive (far more relevant today in our global economy), makes industry far less flexible to change, significantly disincentivizes hiring new workers, etc.

It's like Keynesian policy but with QE on all the time regardless of cyclical changes. Or how price controls on food markets have caused food shortages in almost every country in history who has attempted it (including notably in Venezuela repeatedly in the past decade). It's always done with good intentions and typically works well initially but it's rarely designed to be dynamic and flexible enough to reflect changing realities or appreciate the changes the union itself is having on the company/industry which far too often ultimately harm the union workers themselves rather than helps.