Will it help if Astro have slow Effect add to Gravity?

[althenawhm]

the range hardly helps though, SCH can weave in 2 abilities with each AoW and WHM stuns leading to enemies doing no damage. AST has to completely stop and heal. Giving them a slow to help them mitigate some damage so they can heal a little less and dps a little more hardly comes off as OP.

Honestly, the fact that it is a targeted cast the worst part for me.
"Oh boy, my cast of Gravity is almost done! I cant wait to see the big damage~!"
"Oh no, the BRD killed it before my cast finished, now it just looks like Ive been sitting around not doing anything."
I have the same problem with the three magical DPS jobs too. I vastly prefer WHM and SCH AoE spells because of it.