Curious if you looked at the total watt per gram of the entire system and compare coco vs hydro which would win?
Lights are the same, most things are the same, but pumps and stuff with hydro would make electricity go up. But IMHO yield would likely go up more than the electric bill.
Dunno, there's upfront costs and learning curves to deal with too.
I can say without a doubt that if I were growing for yield / profit, I would pick hydro hands down every time. Higher cost to get into it, but you would probably make it back on the first grow. Maybe.
I've had a 2# indoor plant with hydro. I don't see a lot of those with other methods. Outdoors is a different animal.