> That said, it turns out that a flexible custom text file format, combined with well thought-out concepts and powerful commands, blows out of the water most widget-heavy UIs in terms of ease of use. It's unfortunate that more people don't realize it.

I think more people "don't realize it" because "ease of use" is subjective rather than objective, and for many people, a custom text file format, even combined with well-thought out concepts and powerful commands, doesn't blow widget-heavy UIs out of the water.