But I think that highly skilled professionals of all stripes grapple with frustration and consider changing locales, industries, etc. - and not that many actually do.
I work in the tech industry in NY, and the number of times people I know (myself included) have said, "Man, the tech market here is (boring/too adtech based/too corporate/not worth the cost of living), we should move to (the bay area/austin/the middle of nowhere/the caribbean)" is huge. Very few of us have actually moved, because you become invested in a particular place, you like your lifestyle, you fear change, etc.
Again, not that scientists can't leave - but the article (and the HN headline) throws up the statistic of 18% considering leaving like it means something tangible.
I work at a national lab. Half my coworkers, maybe more, are foreign. If we all got laid off, you could easily bet they'd go back to europe. If I got laid off, I'd either look for a different industry or look to Europe. I know several places I could drop into in Europe with a better success rate than trying to switch to a different lab in the US.