And then you are not guaranteed to grow decent plants. The Marijuana Plant Problems section of this forum is filled with people using designer nutrient lines and having nothing but problems, deficiencies, sick plants, etc... .
That's funny - have you gone here?
https://growdiaries.com/nutrients
Most harvest, most grows, most awards (Advanced Nutrients). Great website, great information, helpful and friendly people. I get the fact that old timers are a little jealous that new people are growing weed - it's not like 20 years ago when you had to do everything quietly. Now, you can go to a website, buy a tent/setup package, buy a nutrient package and even call them for support on the phone. Times have changed - but the old timers are in my opinion quite jealous that so many new people are growing weed - differently, but successfully.
Your statement "Nothing but" is far from true and a gross exaggeration. Very gross exaggeration. You aren't guaranteed to grow any plant properly since a lot of it has to do with Genetics.
Your post is interesting - but pretty much an exaggeration. There are 100's and 1000's of options of growing weed ... and many people mix things. But, people have problems with any and all growing styles because of so many factors. And again, you need to correct your statement about "nothing but problems" - as this is again, a gross exaggeration.
I hate people who exaggerate to make a point - they move so far away from the truth that it makes all the other stuff (which may be accurate and right) less convincing.
Attached are my plants (these clones are 20 days old!) using Advanced Nutrients. Nothing but problems - lol.
Vitagrow is about $70 for the three bottles ... doesn't seem all that much cheaper.