On my Full Int FS, I maxed Heal from the start, and while I really wanted a skill or two earlier than I got them, I ended out being just fine with my buffs. The only real time I felt lacking was from 55-60, before I got my RM points, and I was trying to FS 1vs1s with mainly AoE buffs.
But yeah, I'm 71, with all the things I want, and though I'm trying to choose between learning GT or Heal Rain first, I still have my reskill, and I'm planning to keep it for the indefinite future.