[plopz]

I use the feature, but only because an extension I used before, ClassicThemeRestorer, isn't supported in the new extension ecosystem. The only workaround is to use the css files. I would imagine a large percent of people that used to use the extension didn't migrate to the css files when extensions broke. So they wouldn't be counted in metrics. Also the experience is much worse for an end user since extensions auto update, but changes to the css files have to be manually updated.