I'd say, yes, the elementals are easy to avoid on their own. I agree with that. If there was a powerstone island where there were only elementals to avoid, i'd take it any day over the ones where there are elementals + lions, leatherwings, wolves, etc. etc.
The point is, it only takes one or two elementals to turn a boss hunt into an underwear marathon.
Basically almost every powerstone island is like this:
"Alright John, you take a flintlock and bullets and kite the hydra/drake to our ass cannon boat. The rest of us 20 guys will run naked and distract the elementals and everything else."
It's 99% perseverance and 1% quality of gameplay. Now I totally understand why people not bothering with powerstones at all, because for someone like me who has shown incredible patience in regards to doing these islands, I for one can attest to how tedious the whole thing is and it's barely or next to nothing in terms of fun.