But conversely he had little patience with obfuscating the heart of the matter with unnecessary complications, overly complex or vague language, or pretension of any kind. But philosophers do all of those.
If you read Paul Graham's essay, which I linked to, his proposal for how to fix philosophy is to focus on usefulness. For exactly the reason you stated.
Maybe part of the meaning, is that I'm the course of doing what scientists do, philosophy doesn't move their particular ball forward in the way they want so they can and sometimes do ignore it. Not necessarily that they should.
This guy helped create nuclear weapons, and then quoted the bagvad ghita and had a long time to think about it. I can't imagine it didn't occur to him.
That was Oppenheimer, not Feynman.
Besides, he expressed his negative opinions on philosophy and philosophers in many ways, on many occasions. He very clearly was on the side of those saying that philosophers SHOULD be ignored by anyone who wished to learn science.