I think it's been a free canvas since like 7. Starting with 7 they really started saying "Screw you" to the conventional aspects of the game.
Well... really they started expiermenting with 6... but still stayed true and were mindful of the tradtional FF6 elements.
After that they went all out with the new stuff... all that linked FF games together anymore was the items being procedural rather then creative.
Since then it seems like they just get together, have everyone pitch RPGs... the "best" ID is given the name Final Fantasy and slightly altered, while the rest get made as new IPs...
or lately don't get made as new IPs.
In fact that's why I think they have FF13 Versus. They couldn't quite decide which idea was better.








