I think for secondary stats, the extra Crit would be nice for non-Coil content. Without crit gear, averaging a little below 5% crit on a dungeon run. With about 8+ instance runs a week and soon to be more, some crits may be nice. It's also nice when a Regen tick crit procs.
I try to look at the Astral and caster Rose Gold accessories in one of three ways:
1) If healer is not my main and I do not have i90 accessories, this allows me to start closing the gap via effort or money.
2) Allows for a different build that the Allagan and Hero accessories do not offer.
3) A set of multi-purpose caster accessories that will function for four jobs.
And while I would like to have more options, I think Astral gear is that way where a White Mage could explore the "option" of reliable Cleric's Stance dancing in Coil, otherwise Aeros, Holys, Fluid Auras, etc. can and will miss.
I try to think of the i90 accessories as specializing toward the one field that the stats give us. E.g. of Fending specializes toward survival for a tank, but doesn't lend itself to the Sword Oath Paladin or the hybrid-Defiance Warrior
