Quote Originally Posted by HyoMinPark View Post
Crystal Tools was used to build 1.0 (and was one of the reasons for its downfall). The developers use the Luminous Engine for most of FFXIV now—however, there’s likely still 1.0 spaghetti code floating around, and I really wouldn’t be surprised if its continued existence is why some things aren’t implemented; or why other things are implemented, but operate in an extremely cumbersome way.
From my understanding there is still some but each expansion level patch takes away more and more of it, ie how most of SCH and SMN’s abilities were separated in 5.0, probably as a precursor to the class system being finally removed. My guess is they are slowly removing the old code to make sure they don’t break anything which takes time.