Top tip, later 2013 MBP with Retina have their RAM/HDD soldered in, you can't remove them without removing the solder. You did just answer why SE shouldn't bother with an OSX version of XIV though, you have a system that is built for gaming, a Windows based PC so there is no reason for SE to build an OSX port for you, in fact there is no reason for them to build an OSX port at all, just use Steam and stream it from your gaming rig to your Mac.

At the end of the days, Mac's just ain't build for gaming, which is why those "I'm a Mac" adverts always focused on building webpages and such whilst PC's were office machines, if they ever went for the gaming side....... yeah, building XIV for a non-gaming system is not a Field Of Dreams thing.