[Serious] Generally speaking, is philosophy a worthwhile subject of study?

[John 6IX Breezy]

What substantial idea has philosophy (as done by a philosopher, not a specialist in the area of study)  given in the last 200 years that has actually played a role in physics? or chemistry? or biology? or geology?

Hmm when it comes to psychology and neuroscience there's plenty of collaboration with philosophers of mind. Popular figures which you may have heard of include John Searle, David Chalmers, Andy Clark, and so forth. For example, the psychologist Steven Pinker often goes back and forth with ideas from the philosopher Jerry Fodor on topics of thought and language.

Same thing within biology and the other fields. Questions such as what is a gene, are species real, and what are the units of selection, fall within the philosophy of biology. You can think of these philosophers as metabiologists, bringing clarity and critiques to biological ideas, etc. In fact, it's possible that you've encountered ideas from the philosophy of biology before, and just assumed it was all pure biology.

Here's a short Youtube lecture on The Species Problem.