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Because a 230px thumbnail is hard to see and was unnecessarily small on most modern devices and screen resolutions. It's the reason we changed it in ApartmentGu

• mst 5y ago
  "Google's stupid system reminded us to propagate a change we'd already made on another site for pure usability reasons" is not at all a bad thing but I think the general tenor of the responses here makes it clear that the blog post didn't make it obvious that was a reasonable tl;dr. (I thought I'd read to the end but hadn't realised that was the tl;dr until I read your comments, FWIW)