To limit the probability of an inability to transfer lateral loads from masonry walls to intersecting walls intended to provide lateral support, which could lead to inadequate lateral stiffness, which could lead to an inability to resist lateral loads or inadequate distribution of gravity loads, which could lead to cracking or buckling.
This is to limit the probability of:
For floors and elements supporting floors, this is to limit the probability of persons losing their balance, tripping or falling, which could lead to harm to persons.