Yes, they are outward opening mainly for traditional reasons (which is why UK door go inwards I guess). A Loooong time ago people used to have two doors with ~100mm gap between them. The one on the inside would open inwards, and the other one would open outwards. The a 1+1 'coupled' door solution was used to impove the insulation. When doors got better the internal door was eventually just left out and you ended up with a single outward opening door.
Yeah I was right (again)
Never argue with idiots, they drag you down to their level then beat you with experience!