A lot of assets get reused like some of Disney movies reusing rotor scoped animations, an issue when it's a quality cut that impacts potential enjoyment but otherwise it's just a way to more effectively spend resources. Which potentially could mean additional content / resources for the game, or better work life balance, which is good, or of course it could be copy paste but at least so far I dont feel that.

Also on a thought, wonder if FFXVI might be seen akin to FFXII, as a sort of test ground mmorpg. Or potentially using FFXVI to update assets in FFXIV (like when we get 7.0 graphics update).

Haven't seen anything, personally, that seems concerning and am interested in FFXVI. Also some forms of reinvestment are expected of FF, like when SE tried something new with SMM or BRD and many said they didn't want it much different than it had been, or how primals are also fairly consistent (..sometimes).