Every study I see on WFH that claims "more productive" has no actual, objective measure of "productivity" (most employers struggle to come up with a way to objectively measure "productivity" for the jobs that can be done WFH as it is...). Instead, they rely on self-reported "do you feel more productive?" or worse, "are you happier" (while happy employees should be more productive... it is not a direct correlation, as anyone who compares productivity numbers between, say, a Chinese factory, a US factory, and a European factory can tell you).

I like WFH for a lot of reasons, but I have yet to see "productivity" be provable enough that I would feel OK saying "WFH is more productive".

J.Ja