Fast answer
Frugling is a strong keep, especially for F2P or campaign-focused accounts that want broad Grass value without overcommitting to a niche line.
Why players like Frugling
Frugling is easy to use and easy to justify. It gives you real value without demanding that the whole roster bend around it.
Evolution priority
Solid, usually just below the premium S+ launch lines. Great when your account already has support and needs a second dependable DPS track.