FF14 already has a lot of high res textures that are perfectly fine to reuse. I would dare to suggest that the dev team tries to be as efficient as they can be at developing v2, and I think reusing textures that are already good is the sensible thing to do.

Even if the texture files couldn't be used exactly as they are stored in the current client, the developers should still have the files they used while they made all the textures, so it shouldn't be hard to just load up the old working files and convert these to whatever format the new client will be using and GOD DAMN KIRIA500 YOUR SIGNATURE HAS BEEN CONSTNATLY DISTRACTING ME WHILE TYPING ALL THIS ARHGJGHDFJSKF