I know you've seen a lot of criticism about making this feel more like a Final Fantasy title...
And that may be warranted.

But don't be afraid to strike out here and there.
As much as every game in the title has borrowed from others, it has also added to the great and storied Final Fantasy Universe.

I can tell you enjoy creativity, and I am here to let you know.. I've got your back
You can indeed add things that have never been in the series
New enemies...
New Jobs/classes (I know people will hate hearing this but every game has added jobs that fit in with the story, unless you think Yeti and Blitzballer have been in since the first title)

Please don't let the disappointing launch deter you from innovation.

In short... Definitely borrow from older FF titles, this has always been done and gives a certain sense of familiarity to the world we play in...
BUT... don't be afraid to add to the legend that is Final Fantasy also...
Previous titles don't just take from the brand... they add to it.

So 10 years from now... someone will be playing FFXX and say "I wish they would add Thaumaturge in this game"

If anyone gives you any lip... send them to me