There is no such thing as philosophy-free science; there is only science whose philosophical baggage is taken on board without examination. — Daniel Dennett, Darwin's Dangerous Idea, 1995.

I'm not sure, but I would guess that most of the sequences on LW would count as philosophy in the broadest sense. All of philosophy is important if you ask me, since it deals with meaning, i.e. what is important.

The strength and value of philosophy lies in its freedom to pursue anything and fail.

The philosopher is free by virtue of his or her otherworldliness, by their capacity to fall into wells and appear silly. – Socrates

Who’s going to trace the unknown unknowns if not the philosophers?

Philosophy is a battle against the bewitchment of our intelligence by means of language. — Wittgenstein

If you want to be pragmatic, then you should learn about language to understand what is said in the first place:

…the language which functions as a medium for our grasping of thoughts is not natural language but a conceptual notation which results from a critical logical analysis of natural languages. — The linguistic turn and other misconceptions about analytic philosophy