Alright, i'm not going to read that whole pdf, but i see where you're going, and what you're getting at. If it's necessary for you to live and grow in a bubble, then maybe hydro is better for your situation... but i'm not so sure about "more efficient."
I think i need to clarify: i don't "have a problem with" other people doing the hydro thing, i actually think it's "kinda cool," i merely prefer the soil approach, for my own reasons and circumstances (and as far as i know, i'm not actually using any manure... although i would reckon the fish compost probably includes some fish poop! But it's been composted prior to being added to the soil mix, and the mix itself was then "cooked" for about 2 months before i even had it... i wouldn't want to use manure unless it was rabbit).
Just like the overclocking thing... overclocking, squeezing more performance by applying more power, has diminishing returns, and doesn't yield THAT MUCH more performance anyway. You're not going to double your performance by doubling your power, or doubling your clock speed (both of which would fry most chips, except under the most extreme and elaborate, aggressive cooling methods, which are anything but "efficient"). You won't even get a 50% increase. The harder you push a chip, the less you get out of pushing it harder, and the more energy it costs you to keep it running and keep it from melting itself. You can buy a less expensive chip and overclock it, so you get more bang for your equipment expenditure, but you trade power efficiency for that, which means you're consuming more electricity and generating more heat, buying more gear and spending more electricity to dissipate that heat... and if you got a recent, modern chip, it's almost certainly entirely unnecessary, because most rigs lack power in the GPU department, not the CPU. And ever since people blew up their gtx590s (lol), nvidia has put a damper on the whole gpu overclocking thing (and AMD/ATI are less efficient anyway, and seldom superior to nvidia, and when so, only at the top tier, by a tiny margin, or otherwise based on specific cost-level markets). I haven't been keeping up with that scene much lately, but i saw the 900s have hit the market. I'm sure they're significantly better than what i got, but i'm also sure the game devs haven't started coding efficiently yet, because they still have the luxury of excess power available in the modern gpus, and the pressure to release as soon as possible, rather than "when it's ready."
I surely wasn't trying to bunch anyone's panties, or imply that hydro is "stupid" or whatever. I think it's cool, it's just not THAT much better, if at all, and it's not the way i want to do things. From my experience of running an overclocked and watercooled PC for several years (more than one build), i know hydro will not be right for me. I don't want to worry about equipment failure any more than is necessary, and i don't want to have to buy things that aren't going to give me what i define as a "worthwhile" advantage. I see the "advantages" of hydro as being significantly offset (perhaps nullified) by what is required to correctly maintain it. But just like overclocking, i still think it's cool that other people do impressive things with it. But i already have enough shit to worry about. If i went with hydro, it would be like having another watercooled OC'd PC. I learned my lesson about "monitoring stress" already. It's stressful to have to monitor delicate equipment being pushed harder than "intended." Once the soil is right, i don't have to mess with it anymore. Plus, i like to lean toward "nature's ways" when possible. Not trying to say anyone's stupid for using hydro.