I have never understood why drive in racks that intrude into the operators area are permissible. Operators have little space to operate as defined by the rear posts or raised backrest and allowing racks to intrude into that space makes no sense with respect to safety of the operator.
Clark ESM forklifts had reversible rear posts to allow for drive in racks but the operator has to lean away from the side of the machine to get into the racks.