TC
In the on stand evacuation example I quoted, a further complicating factor was that we had no cabin crew, the pilots fulfilled that function. In my opinion, the incident also served to highlight deficiencies in flight crew training in these circumstances. We were lucky that we could evacuate via the pax door but if the opposite engine had been involved, we would have been using the emergency exits (windows).
It's interesting to observe how the military do it. They seem to regard departure from/arrival on stand as a critical phase of flight and it's obvious that the ground crew have a safety role in addition to marshalling, receiving/escorting non-military personnel, etc.