(Psi)SeveredHead
Adventurer
I guess I'm just confused as to why, on the one hand, doors are so hard to break down, which suggests they're supposed to be significant obstacles, but on the other hand, they're easy to chop down, which suggests they aren't supposed to be significant obstacles. It just seems like a contradiction. Unless the designers only meant them to be obstacles if the PCs are weaponless...
Simple. Hacking open a door is easy, but not quick or stealthy.
If you're in a prison, they don't want to make breaking down a door unarmed easy. (Never put a monk in prison; not only can they break doors, but they often have ranks in Escape Artist.)