Did you actually build the wall or just sharing your expectations of how it suppose to work?
I start noticing that so many people give their advises not from their own experience but from someone else thought/ideas/fantasy's, this is not helpful at all. The person whom you advising to, will just waste his time trying to achieve something that is completely broken and should be dealt with by devs.
Hear me out, I'm not discouraging from helping others in need with advise but be aware that you can be responsible for making this game less fun to someone and creating impression that there is no bug or problem, when problem is actually there and have to be addressed