It's a conspiracy, I tell ya!
Since the steps and the handrails move at a different rate, it is impossible to continuously hold the handrail during the short trip. (It's more noticeable on the moving sidewalks.)
Lawyers require the discrepancy that will require you to let go of the handrail. Since you're supposed to hold on to the handrail, and since you won't, it will be
your fault when you have an escalator/moving sidewalk accident. The manufacturer cannot be held laible when you blatantly disregard the safety rules and let go of the handrail.
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