I like your examples, but I disagree. Having also read Plato and many of the speculative writings that address his work, much of it is still up for debate, especially when context is not understood. Feynman, whom I enjoy as well, often said some really nonsensical things that he probably thought had a lot of philosophical depth (I think specifically of
The Pleasure of Finding Things Out which is a nice feel-good piece but does not bring much meat to the table afterall). To be fair to him and your example, he did absolutely have a knack for breaking down scientific complexities to terms non-scientists could grasp, which I applaud. Yes, let's do more of
that.
So, sure, there is a time where simpler language is an exercise in how well you know a thing. Being able to break it down into simpler terms makes sense. But we do have to be careful with the language. It's dynamic, as you mention, often subject to interpretation that could lead to misunderstanding or improper handling of an idea. I did it in my initial reply.
That said, one must know one's audience and subject, I think. Am I conveying a concept from physics to non-technical individuals who might not care what I have to say in the first place? Sure, simplify. Am I telling a story about a personal experience or some relatable problem in my field? Expect a detailed and nuanced picture to be painted.
Thanks for the comment, it gave me something to think about.