Das sagt übrigens ARIEL(moddingway mod) zum Modding in Fifa 17.

My conclusions after the first look are that FIFA 17 is almost impossible to mod. In best of cases we will be able to add textures but do not expect more than that. Modding FIFA as we know has ended. Forget about new teams, tournaments, etc. I repeat, if we are lucky we will be able to add textures and probably it will take long time until we find out how to do it.
Alle scheinen sich wohl einig zu sein...Das modden wird ein harter Brocken.