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

[Angrboda]

Considerations of these interpretations may have an impact on future findings, though.

Refer to the Aeon essay I posted earlier for an example of what you actually requested.

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Depends on the specialty of the philosopher. Those who specialize in mathematics and in science are expected to be as good as physicists in understanding the science and math. It's part of their expertise ...

By the way, it's physicists (not mere philosophers) who came up with many of the interpretations for quantum mechanics. Ironically.

And I was asking for actual philosophical theories that turned into good scientific ones.

That's not what philosophy contributes to science. In the same vein, no mathematical theories have turned into good scientific ones. Yet you'd have to be an idiot to think math isn't essential to science.