You get a range of skills while working on a science PhD that will benefit you in industry no matter where you end up. If you choose to study an area that actually has industry applications then its even better.

If, on the other hand, you get a science PhD and spend all of your time working with some insanely complex device that only has 1 application studying an esoteric process that has no industry applications... then yeah you're going to have a hard time finding work. This is the story I have seen over and over again among my friends and colleagues that get PhDs.

If you're a graduate student be smart about it and make sure you get the experience necessary to help you find work after graduation! No one else is going to help you with that, it is up to you to build your resume.

Professors that take advantage of cheap labor and don't help their students transition after graduation are a problem that Universities should take up. It is to the University's benefit to get their students into nice industry positions.