What's up with the luminous engine?

[Intrinsic]

First off, KH3 didn't "drop" anything as it was never said it was using luminous engine to begin with.

Now to answer your question, what I think is that there never actually was something called luminous engine in an engine sense of the word. There was probably a tech demo or two here or there and SE being SE just claimed that they had some sort of super engine up and running.

What I believe is happening now is that whatever engine is being used to make FF15 and is being called luminous isn't really an engine at all. its just a collection of very specific assets with even less documentation that's being built on the fly to suit whatever the team needs for FF15. So adapting the engine to any other group of devs would be extremely difficult.

Because I don't see how it would be possible that any company actually builds an engine over the past 5 years, then start making one game with it and then completely ditches the engine for a third party engine for all other games being made in the same timeline.