The Space/Zone tool is definitely a needed feature, and there appears to be a lot of depth to it, but it is completely useless because you cannot export the correct information into GBXML.
It is completely impossible to export correct exterior/interior wall information. I realize that MEP will try to figure out which walls are exterior if you use associative spaces, but obviously the program is not nearly capable enough to do that correctly. I'm not even mad about that; I will gladly specify which walls are exterior. But MEP cannot even handle that. It doesn't give a **** if I specified every single ****ing wall as either exterior or interior. When I go to export to GBXML, it makes **** sure to completely disregard this information and either figure out what it thinks are the correct exterior walls or just make them all exterior.