Is there a reason, for example performance?

I was also wondering why why there was no option to disable the teleport? Or if there is an option to disable it where is it? I regularly relocate villagers to new homes for one reason for another and build walls around their villages. Them having the ability to teleport out of the confines of their room before they settle and accept their new home, or teleport out of the borders of their village defeats the purpose of my building the wall after fixing up their village in the first place.