My biggest problem with the new card buff is how badly adjusted it is. I almost forgot the info of old cards and had to google for a bit. Thank god the old info are still available.
http://www.ffxivinfo.com/job/astrologian.php

Take a look at the balance, bole, arrow, and spear. These main buff cards no matter their effect, they all have base duration of 30s. When using card on a single person, I could also use time dilation to add 15s.

The new cards even thought they are all damage buff, they lasts only a pathetic 15s with no way to extend. I said new cards are a waste of time is because so far when I played DPS with AST in party, the 15s buff feels like nothing at all. Imagine someone lift you high up and immediately drops you to the ground. That's how I felt as DPS given buff by AST now. It is not long enough to feel the impact. It's a rather depressing feel than good feel.

Divination though it is now more frequent with shorter cd, it's still a pathetic 15s buff that comes and goes like a blowing wind.

If new cards have the same 30s duration, I would be more indifferent towards the whole new vs. old thing.

Not gonna lie, I never liked handing out cards one by one. Outside of 4 man dungeon, it's aoe royal road or GTFO.