I can accept the argument of technical limitations on SE's part, as it wouldn't be the first time in their case (hence the "PS3 limitations" and "small indie dev" memes), but the other BS excuses I've seen whenever these kind of topics come up are just that.

SMN and SCH came with 2.0 launch. ACN was in 1.0 but was not a playable Job and gameplay wise was going to be different from the current incarnation.