It's not quite removing the walls, think of it more as a ton of tiny castles dotting the landscape with equally good walls instead of one giant wall around the

It's not quite removing the walls, think of it more as a ton of tiny castles dotting the landscape with equally good walls instead of one giant wall around the kingdom and some unprotected wooden huts inside. By doing this they want to force those managing internal apps to put up protection on the level they would for any other external service. Overall it's leading to better security (at least that's what they argue).