>Consider that not all communication is about "getting ahead".

But you don't need to follow any advice if you do not seek to get ahead (i.e., better) in some sense. So, that doesn't make sense as a counterargument. OP's point is that you can become better at explaining, but that on its own does not add value. This is quite evident in scientific writing. Plenty of well-written papers are rejected if they do not provide sufficient value.