It actually wasn't done for Carbonite's sake, it was done because I (and others) found the entire game would crash when using Carbonite and other addons which also utilized the map (*cough* Zygor *cough*) and I narrowed it down through stack trace print debugging to be those 2 function calls being called thousands of times in seconds by that particular addon triggering the lua anti-spam.
The point of the replacement was to abort any call to set the map if your trying to set it to the same zone already being displayed which immediately stopped that problem from happening.
I am definitely open to suggestions of how to deal with other's bad code
