Also, comparing Call Wyvern to Astral Flow as 2 hour abilities is terrible.
I was comparing people who get their 2 hours as JAs and those who don't. If my intention had been to compare Astral Flows, it would have been towards -ga spells that are just on individual timers. It really isn't that huge difference between Astral flow and -ga spells though. Mainly that you can use too few SMNs and still live after AOEing with astral flow, while you need enough BLMs AOEing to kill most stuff directly.

I'm sure someone will go talk about Astral Burns now, but that only really works at level 20. If you are a level 60 SMN it just doesn't perform as good as a decent ga spell, not to mention BLMs have sleepgas by then so they can just spam it and hope for the best.