The lack of a hyperlink from sin to sind is a mistake in this PR. From the response to that, I believe that adding more & better examples is usually welcomed, and doesn’t have to get stuck in review hell.
I don’t know whether everyone wants them as long as the Matlab (or Mathematica) per-function docs; keeping that much text up to date might become a burden. (And might require some more complicated mechanism to store and display the text than help?> sin.) But there’s a lot of room for incremental improvement first.
For an example of this, NNlib has uses UnicodePlots in docstrings. It wouldn’t be crazy to show the shape of the functions in Base, although I’m not sure which ones — should it be taken for granted that readers know what sin looks like?