RIP Astrologian

[SongJoohee]

Yes, but reports of the out of combat limitation has come from other sources since the NDA got lifted.
Check here and here.

They didn't want to change the WHM and SCH dynamic, so AST can fill in for either.
It can't, however, do both at the same time (which would just make them the best) which is why you can't switch stances in combat.

I hope it still feels unique to play.

Please don't use mine or Orange Jedi Mans docs as direct sources, we collected information and shouldn't be treated as a proper source like a proper interview from a real journalist should be. You should be asking or providing sources directly from the press.

For those wondering the source for not being able to switch in combat is from Dengeki online.

ただし注意点として、戦闘中の切り替えは不可。パーティ編成を見て、あらかじめ切り替えておく必要がありそうです。
http://dengekionline.com/elem/000/001/056/1056760/