Imperatives for Idiom Creation

Pretty much "yes" to both questions, with an exception for a few philosophers who are already not really philosophers, like Peirce and Wittgenstein. Philosophy has its origins in "what do words mean," and if we now know, we don't need philosophy. But I would never think to tell anyone what they should or shouldn't read, and some philosophers are great thinkers who at least provide useful thought experiments. The real point is that they're not needed as a "ground" for anything. One should never feel obliged to situate oneself philosophically in order to "legitimate" one's position on some other matter.

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Yes, absolutely.