What should have happened here is that Biden should have pressured the companies to resolve the strike as quickly as possible.
Workers generally don’t like striking. Not getting paid sucks. It’s really the only lever of power they have in a lot of cases though.
Banning their ability to strike means that the only options they have left are to suck up whatever awful conditions they have or quit. Quitting en mass would do the same damage you’re talking about, but far more permanently.