I dont agree with this flow chart. It's not the way astrologian should be used imho.
What I love about astrologian is that this job is incredibly situational. In some fights like a2s i use Spire to refresh tps of my melee and bole one of my tanks while I solo heal them both. And of course there are fights i draw only one of two balance, if i did what your flowchart says i would use just a few cards per fight. If you wait the card you want, sacrificing the others, it's like you're not supporting your party but you're playing a white mage that sometimes plays with cards.