It is only logical because people are ignorant to what makes them high. There is more to getting high than THC and if they understood that; they would harvest differently. Other cannabinoids including CBN ENHANCE THC's effectiveness.
Watch the first 2:15 to see what I mean.
http://www.youtube.com/watch?v=x9J2N6_bl0A
Cannabis is a mixture of compounds that work together. Targeting one compound and harvesting to maximize that with no regard for other compounds in the final product ignores the importance of the cannabinoids. It will reduce not only your yield, but ironically potency as well.
If you want a head high - GROW A SATIVA!!!
I have preached the purchase the right genetics rather than try to alter in some way wrong genetics to get what you want, for years. Some people get caught up in the what’s the flavor of the month, which one won the last cup, which one are people talking about the most right now, what was the name of that one they used for the title of that funny movie ….. that’s the strain, that’s the strain I want most, that’s what I’m buying mode. They often make horrible choices of what to grow in relation to their actual likes and dislikes and at its worst, in the case of a med patient that has particular needs, they go off searching for Mr. Toad’s Wild Ride rather than the best possible medication for them that is available.
I hate it when I see that … and I have seen it many times.
The one I have mentioned the most is the opposite of this topic, the I want couch-lock but I purchase high THC level, low CBD level, low CBN level genetics and then try to make up for the CBD that should have been in the genetics, and more CBN too, and flower longer letting more THC oxidize and become CBN and try to get couch-lock that way.
That sort of thing makes no sense to me.
You can fine-tune things and considering all the genetics existing there really is no singular across the board fits every situation perfectly way to fine tune. But even if you are the best at it all you can do is fine tune.
Just like in the example above it would make no sense at all to purchase genetics that are predominantly indica, especially when a heavy one, and attempt to end up with a true or close to real sativa buzz just by harvesting early.
It is only an opinion but at times I think so many growers today are from the era of the ‘modern strains,’ the crosses of various types and who seldom if ever have grown or even smoked a pure anything let alone a very good example of both a pure indica and a sativa. What they are used to somewhat falls into a group that for the most part is not all that different.
What is really indica or really sativa to them is really not all that much different, not as different as they tend to believe, so when they fine tune one from one end of the spectrum they know can get it half-close to another from the other end of the spectrum they know.
It gives the perception of greater variability and range and control existing than it does.
It is only my opinion but based on what I have read and observed over the years it half seems to explain it at least in part, how the perception that harvesting by trichome color makes a major almost genetic altering difference.
When I read or hear an exchange about genetics and making choices it is common to hear or read something where it is obvious someone, if they do not change their mind, is about to make a mistake.
If people really want to get the most enjoyment out of what they grow they need to learn more about what cannabinoids do and in what levels are they in the types of strain they like and then they have some guideline for future choices that will eliminate true errors.
Once they do that it if they can cancel their subscription in the strain of the month club and look for something more specific that opens them up to looking into breeder lines that they otherwise might not look at or try.
There are some real gems out there that I seldom if ever read or hear about, but right after “Pineapple Express” hit the theaters that is all anyone talked about and all the rumors and urban legends and quotes from interviews and people were argued over it, but the same people also searched the seedbanks for anything by that name. Once found, it was purchased.
That sure is one heck of a solid reason to base one’s decision for picking genetics on.
Research and pick the very best genetics that you can for yourself, ones that best fit your likes and or needs, even if it is something no one here ever heard about before. Forget about having to have the Nike and Reebok strains. Then if you want to experiment some and try to fine tune it to see if doing so makes it that little bit better that makes it perfect, go for it.
But don’t pick genetics that are way different than what fit your likes and or needs and think you will turn water into wine by harvesting earlier or later, or at any given trichome color. It just ain’t gunna happen.
Genetics will always hold the overwhelming majority of control over what something will be when finished and regardless of how great the genetics might be for someone else, if the genetics are wrong for you, they are crap .. and you can’t make chicken salad out of chicken shit no matter how much mayonnaise you add, so start with real chicken and you will be far better off in the end.
DONT ONLY GO BY TRICHOMES, THE PLANT WILL TELL YOU WHEN SHES DONE, YOU WILL FUCKING KNOW I SWEAR TO GOD, it will tinge, glisten, give you a boner and make you cry all at the same time 
hope this helps someone good luck fuck charts
