I don't know how true it is that niche topics are unwelcome. I wrote this article about a year ago in hopes of getting this implemented in Python's statsmodels, and so far nobody has told me that this very niche topic shouldn't be in Wikipedia:

https://en.wikipedia.org/wiki/Medcouple

I've gotten a number of helpful edits for it too.

I also referenced it from the much more mainstream Boxplot article:

https://en.wikipedia.org/wiki/Box_plot#Variations

So, my experience has been positive so far.

(Btw, I'm still hoping someone will implement this in statsmodels.)