It depends I guess. Does a surgeon or anesthesiologist have to know Dutch to be successful? Or even a dentist? Btw the Netherlands has quite a few people who don't speak Dutch at all..

Southern Europeans usually don't speak English very well either. So there's no easy solution.

Well yes they do. My English is pretty decent, but I think most people would have problems having technical discussions about their health in English. Imagine a 70 year old with dementia in a nursing home. Miscommunication in healthcare costs lives.

Yes, (by far) most people want to be able to talk to their surgeon or dentist.