I don't disagree at all. I can walk many miles at 3mph. At 1.5mph I'll be in pain pretty quickly. But if I really want to suffer, I'll stand for a couple hours.
So I don't have a standing desk, either. I primarily sit when working at the computer. But every 30-45 minutes I get up and go for a stroll, even if just around the yard.
Yeah I gotcha. Don't get me wrong, nothing beats sitting down to work. It's the best. But with kids I don't have time for the gym, and a stroll in the yard wasn't helping my growing waistline.
fwiw my walking desk is set to 2.4mph, which seems to be the sweet spot between my natural walking speed and a pace that I can still comfortably read and type. Pretty much a linear ramp up from 1.0mph to 2.4mph over 1 year period.