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People frequently don't read signs, which is the point of the affordance design (plus caters to folks who can't read the given language). Also, hands make stuff dirty - you do want something there that's easy to clean, though that can just be a metal plate that can't be pulled.

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but you could take the sign away and imo people would still open the door - simply because that seems to be the only thing they could do. plus with the whole door surface being available, why would you use just your hands? use your shoulder or even back (if you happen to be carrying stuff in both hands)!

seems to me like that would be more affordance.

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