Except... RNW only works until it doesn't. There are tons of posts out there about the RNW reverting to the "real world" upon loading the game. I had this happen to me, which is what led to searching the 'net.
There is no recourse--your game is effed unless you continue with the non-random world, but then you have some very weird results. For example, Castille having colonized land in the middle of North American with no one nearby, etc.
Anecdotally, this happened to me in my Inca achievement run.
This has to do with mods, is an issue introduced in 1.9 and is fixed in next patch.
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