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From my perspective we measured by deadlines missed/hit.

We hit all, so no measurable loss on productivity.

Nice. Should be interesting to experiment with 4 day workweek next.

Let's use binary search instead :)

There was certainly a productivity per hour worked hit, as people replaced their commutes or more with screen time.

Folks are overall more productive, yes, but at a cost of more hours worked. The marginal productivity and its rate of improvement is not as high.

Even if that's true, I'd certainly rather spend N hours a day programming than N-2 hours programming plus 2 hours commuting.

Very few people translated commuting into working. Whereas before you had N-2 hours working, many folks now have N+M, M>0.

You spent n-2 hours a day before? Productively?

Pick any value of N that you like. Commuting time definitely subtracted from my productive time.