I literally cannot understand the point you are making.
Are you referring to relativism vs. objectivsm? Or, that people can have the understanding of a concept, but lose it in trying to explain it?
I'm really trying in good faith you get you to make what I consider a coherent response. Personally, I've studied rhetoric, logic, philosophy (the moral kind), and science (the natural philosophy kind). I have a subtle enough knowledge of all of these to understand and appreciate nearly all points of view and have intelligent discussions with a wide range of people on a wide range of topics.
But, so far, nothing you said seems to contradict my statement that the P in PhD refers (with the exception of people getting PhDs in philosophy departments) to natural philosophy, which is to say, the quantitative, experiment and hypothesis based approach to understanding how the universe works, as opposed to moral philosophy, which is a primarily logic-oriented approach to abstract and concrete problems experienced by humans.
That those two intersect to some degree, and that some people who obtain PhDs in quantitative fields do spend some time being introspective about moral philosophy, but it's not commonly required in the form of coursework or research.
Perhaps the closest relationship between moral philsophy and natural (which is what we now call "science') is math, and it's still very much an undecided problem as to whether math and science are the same thing (https://www.dartmouth.edu/~matc/MathDrama/reading/Wigner.htm... and https://en.wikipedia.org/wiki/Mathematical_universe_hypothes... being the two most interesting statements on that problem) and whether the logic employed by philosphers is the same thing as mathematical logic. There is some useful prior writing on this, for example https://plato.stanford.edu/entries/philosophy-mathematics/
Ultimately though I just can't see what point you're making. I think you're saying all knowledge is relative, and even scientific/natural philosophy is identical to moral philosophy, rather than "all students of the natural sciences should also take classes in philosophy to develop a more intuitive understanding of epistemeology"