Yes they would. The Americans also go to other countries to seek treatment in special cases.

Also, if our healthcare works well to treat rich foreigners in special cases, but sucks otherwise — I say, we should scrap it.

But sure, we can cherrypick metrics all day long.

This is a great point more people should make. There’s nothing “America first” about preserving the inefficiencies of a system just so that very wealthy people from everywhere can get care and leave (and ultimately specialists would anyway still exist, even if their treatments aren’t covered by Medicare)

Actually, that's completely what "America first" means by those who say it, at the least the ones who are in on the deal.

if everyone had that specific knowledge, there would be no specialists. no, different countries develop different specialties. famously, Kobe Bryant went to Germany (a country with national healthcare) to get a knee procedure from a specialist.