FACT 1: There are not any soybeans in Soylent.
FACT 2: Pesticides are actually fairly sustainable. We have been using one form or another for over a century. Living with a farm growing up, you pretty much had to use pesticides for most things, not all though.
Although I do agree it can be bad for the environment.
FACT 3: Soy (even though it is not used in Soylent) does not raise estrogen levels. This was a myth disproved a couple of years ago.
http://blogs.webmd.com/healthy-recipe-doctor/2011/03/four-soy-food-myths-exposed.htmlFACT 3 part 2: This product technically has not hit the market yet, and they aren't selling anything as of yet. Most of the people on this forum, including myself, have made or are using a do it yourself version of Soylent. Meaning that we did some research, created our own recipes and formulas and are using them in our day to day lives.
The fear that you are expressing is the fear of change or the unknown. Because you have not done the research your fears are baseless. If you have something specific that concerns you then that is something that we can address. If we are proven wrong then we adapt and move on. But saying that this is a bad product without anything specific is just FUD (Fear, Uncertainty, Doubt).
As for diets go I probably had one of the poorest diets on this forum. I did not and still do not eat any fruits or vegetables. I just don't like their taste so they were not part of my diet. Unless of course you considered ketchup the same as tomatoes.
We have all been doing research into what the body needs as far as minerals and nutrients, and we probably have a far better grasp than you do, and in some cases a better grasp then GP doctors.
On a personal note for doctors, I don't know why you put so much faith in them. Every time I go to the doctor I am prescribed the same 3 things (anti-inflammatory, pain killer, muscle relaxer). Different doctors, different problems, different days. I have seen more doctors than I would care to remember in my short life, and most, not all, but most of them are worthless and drug pushers for the pharmaceutical industry.
Soylent aside, please what ever you do, do not take your doctors word as the gospel. Go out and do your own research. If your doctor is right, then great. But if he is wrong then you will be better off knowing.