That holds for anything through - including programming. Why would it be so hard to accept that a group of people can be active on internet without adding stuff to wikipedia?
Wikipedia is crappy about anything sewing, knitting, embroidery etc related. But whenever I need something, I can find information on reddit or blogs or youtube quickly and easily. It is not that information does not exist on the internet in general, it is that those groups dont find wikipedia place to put stuff in. It is not even that those groups cry for wikipedia to add them in cause they are helpless without that. Wikipedia is not a thing in that space, because who cares about wikipedia and anecdotally those few who tried found it generally waste of time and frustrating.
This is wikipedia finding about situation, because its mission is "to be the largest, most comprehensive, and most widely-available encyclopedia ever written" and it is failing in these areas. And somehow people take offence on that.
Not a problem for me, I agree with your post.