Why is WIMP convenient?

This is actually a small Habra flaw. I remember that a blog was presented here, in which it was proposed to publish questions to the public on certain conditions, but I do not remember either its name or its author to find the blog ... Therefore, I’m writing in a personal, maybe someone will give a link to that wonderful offer.

So. Questions for connoisseurs of user interfaces: why is WIMP so convenient? Or is it really not that convenient, because people are happy to use HTML pages as interfaces to all kinds of applications? Why? Is there a comparative analysis in nature different from the eternal WIMP vs. Command line?

Here. If I collect enough material on the topic, I promise to write an article, as suggested in the blog I lost.

UPD: the blog was found.