Undraw was added in Stormblood, and it was added due to no longer having a way to just throw away a card you didn't want, when they tied cards to the, "card gauge."

Diurnal Sect used to add 5% haste to your casting, which it no longer does, and that is why it was introduced prior to allowing Astrologian to have Regen... a full level earlier than WHM gets it.

Nocturnal used to add +15% healing.

The SCH /SMN thing is SE trying to separate the classes from one another, because they deem it too powerful to be able to level two roles at once, and claim that it is hard to balance. Nevermind the fact that SCH was never out DPSing DPS, and has been weaker than WHM DPS wise for quite a long time now. The 15 level difference is because at first in SHB they made it so SCH couldn't use Aetherflow for DPS, meaning it was pointless to have until 45. Bane used to be available, but no longer.