Tiredness, luggage, children, trying to make sense of directions, being in company... so many reasons not to walk. In fact, I bet most people never walk at all on an escalator.
The number of people who are otherwise healthy but refuse to walk up stairs just shocks me. I’ve never felt like walking up an escalator carried any significant risk for the able bodied...
I don’t know how to explain it except that people are shockingly lazy and just overall have really screwed up risk assessment
I've got long enough legs to comfortably ascend two stairs at once and I prefer the exercise as well as the speed of ascent and descent.
Being tired is a fair point, but that's why there was left/right side compromise.
Still not sure it should be encouraged, though.