The Importance of Regularization in Language

I didn't look too closely at your interrogative pronouns and indefinite pronouns. It looked like all the indefinites are derived from the interrogatives, which is very, very regular indeed. So that's why I thought maybe the excuse could be that whoever speaks that language, live in a very prescriptive society where they have some people who have a strong hand on the language. Maybe it's an academic, academic process on steroids. That works as an explanation.