Well, I agree with you, mostly, but here is the thing...
My buddy has re-discovered prawns off the Oregon coast. I say re-discovered because I know we aren't the first to fish them there but he just had his first successful trip. Well he got 1 and that is better than anyone else I know of. The thing with fishing Prawns ni the open water is that the Jellyfish are thick and they sting like crazy when they get into your ropes. Not to mention we are fishing around 300 feet deep and need enough scope for the current etc.
I am thinking that a gas engine is certainly faster but is also: more expensive, gets hot, gets temperamental after being exposed repeatedly to a salt water environment and you have to be aware of fuel and oil concerns (leaks etc).
The best electric pullers are also expensive but typically they are lighter, store easier, operate quieter but they are also: Slower and the life of the electric motor and components in a salt water environment are questionable.
If money were no object I would probably go with the Cushman as I believe they are a bit more towards the commercial end of the scale, heavy duty.
Maybe I'll just wait until my buddy is pulling in buckets at a time but then I wouldn't be there helping him make history, I'd just be reading about it. And I could surely go to the store and buy my prawns, but I would rather catch my own. Kind of like eating my own canned Tuna that I catch myself... anything else is just cat food once you have done it yourself.