I'm not seeing a problem with harvest moon. It's a massive dps increase in dungeons because you get one for free between every set of mobs, and in real fights it's a ranged gcd you can hold in reserve indefinitely as a last resort, with an extra bonus if you have long enough downtime to cast soulsow again. I believe it also has niche applications in high end play for cases like bursting into damage buff windows, or as a filler gcd so you don't go into enshroud with unfinished combos and the like.

I think it's a meaningful addition to the job that provides interesting gameplay options.