We called that FFXIV 1.0. You could cross-class from ANY of the choices to effectively build hybrids. It didn't work out so well. According to user surveys and developers, it wasn't enough iconic Final Fantasy and classes lacked their own identities, which we see the opposite in this version, where every class (really more job) has its own identity. Both styles have their merits, but SE is going to do what they think will make the most users happy.