its just the way things have always been, if monsters spawn near your land they try to attack you. with Mickey's new system that would be monster's drifting toward your land I guess...
if you have good walls they can't get to you. if you have windows/slits they can get you with range attack. if you have no walls at all(as a pure crafter) you're dead.
so a dragon drifting near your walls(if able to fly) would fly right over and eat you. if it wasn't able to fly it would be stuck outside trying to attack you. if you had windows and dragons had a range/magic attack(dragons breath? range of 2?) it would be able to attack you if you got too close...
I'll admit the idea of monsters being able to break down walls sounds interesting(and maybe should be discussed), but if they can, how do we stay safe? would monsters have a certain amount of damage they're able to do, would different types of walls have different damage thresholds? ie: weaker monsters can't break anything, medium monsters can break through fences, strong monsters can break through wooden walls, but only the most elite monsters can get through stone walls? if those seriously bad assed monsters can still get through stone walls, and the people hiding behind those walls are hiding so they don't have to(read that as can't) fight, doesn't that mean traders are basicly tigered?