I don't believe that changes are being made as thoughtlessly as this article portrays. Twitter employees read the same things you and I read, you can be damn sure they're aware swapping the Moments tab caused a bunch of accidental clicks.

The article ascribes the decision to ignorance, or being bad at measuring. That doesn't feel right here. Swapping tab order is going to guarantee more people look at it, and maybe the thought process is that twitter moments is a great feature so even some accidental clickers might start using it as a result of actually seeing it for the first time.

Call it hubris or not caring about your users or whatever; the point is, all of these "dumb" decisions are being made by people whose job it is to think about them.