Yes, we used AppUI module to get the logged-in location of the user via the session (See here). Then we are replacing the login property by the user property (See here) - It only applies if the user doesn’t have the location property at login time (For some existing users).
But when we totally migrate to LBAC, we will not have any location selection in the OpenMRS Login screen. So we don’t need to depend on this AppUI module or fetching location from session since no one can log in to the system without having location property.