What’s with all the complaints of neoliberalism, like healthcare workers in the Netherlands striking from low pay because of the gov slowly ‘adoping’ the US system?

I’ve heard that with more competition, free-market healthcare would work fine, but it seems like there’s always some issue everywhere that they attempt to privatize it. They say the devil’s in the details. What exactly are the details? Not just in Holland but anywhere privatization’s attempted. I think the UK’s NHS has been dealing with stuff too, but some say it’s mostly because of old people and some drug addicts overwhelming the system, corrupt admins and Tories making cuts. Maybe the Swiss system has a better public/private balance?