Originally Posted by randomflyer

It's just a technicality, but I thought the reason non-upper deck pax were not allowed to visit was because that is where the access to the cockpit is. And somebody who wants to "visit" and on that visit seems to want to walk toward the cockpit might be one of the reason it's discouraged in the first place!

Even cabin crew in my experience try to limit their own foot traffic during rest times (like the overnight flights).