In writing (both prose and code!) there is always a question of target audience, which inevitably excludes the not-target audience. Personally, for a field in which I'm an expert, it's really annoying to continually wade through introductory material and hand-holding just to get to some small nugget of substance. In that case, I'm definitely not the target audience, so I'll go looking for another communications channel that offers the compressed/elegant/general/abstract/terse formulations I desire. Please don't then insist that I'm being unfair and exclusionary if you're not the target audience on those specific communications channels.
For math papers and whatnot, whitepapers are like the one established channel for experts, while everyone else has textbooks, introductory pamphlets, blogs, youtube videos, etc. I agree, however, that there are cases where non-experts could benefit from knowledge siloed within expert communication channels, but this is an unfortunate systematic side-effect not malice.
Honestly, with software development, I find it disappointing that our social conventions currently conflate "readability" with "comfort and familiarity to Generic Programmer" instead of something more useful like "facilitates domain understanding and insight to the primary developers".