I'm intrigued by the reactions here. I'd also be interested in seeing the filtered data for themes updated in the last two years.

But taking the data as it is, for me, it's actually quite surprising that after three years (and fair pressure), only 24% of themes use the customizer. But the number that's even more notable is that 50% of themes have a options pages.

That means that the decision to require the customizer instantly renders 50% of all themes in the repository out of compliance, and compels them to adopt different approach or face obsolescence. That seems epic to me. It's also worth noting that there are two times more themes using options pages than use the customizer. In that sense, we're also imposing what is currently a minority approach on the majority.

Everyone seems to be assuming that the themes using options pages are old or are out of date. That could be, and that's what I'd be interested to see. But an alternative and equally plausible interpretation for now - and one that's generally supported by the theme market outside the repository - is that many theme authors and users just like options pages more than the customizer, at least for certain uses.

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Anyways, apart from all that, neat data and I'll be interested to see what else comes out of it.