Actually, that is what the information posted was telling him, or more accurately, teaching him.
What could be clearer than the following?
The capitate-stalked glandular trichome changes color as it matures. Newly formed and immature glands are clear, glands reaching optimum THC production are cloudy or milky and amber trichomes have already passed their peak. By looking at the trichomes you can also determine the best time to harvest your plants. When most trichomes have gone cloudy and a few amber ones have appeared, the plant is at its peak.
Cannabinol is the primary degradation product of THC and increases in concentration with plant age. The concentration of this product in the bud is heavily dependent on the time of harvest. Harvesting the bud at a late stage also means that the concentration of CBN in relation to THC will be higher when compared to the peak of THC production. CBN is only mildly psychoactive and can cause "fuzzy head", drowsiness, disorientation and sleepiness in the smoker, properties that can be considered unpleasant in nature compared to the clear high of the THC.
The rest of the THC biosynthesis information was not in response to the OP but instead a response to someone who inaccurately stated that CBD becomes THC rather than CBGA becomes THCA, CDBA and CBCA and those become THC, CBD and CBC.
But the part about how oxidized, degraded THC then becomes CBN and that occurs when plants are harvested late and amber trichomes are in abundance and how amber trichomes are a visible sign of oxidized, degraded, lost THC was, again, the answer to the OP.
Facts were provided that would allow the person to make an intelligent informed decision as to when they should harvest. The rest, those who said things like, I like this, or, I go for that, etc. were nothing more than beliefs or opinions that are normally formulated from having been ill-informed, but believing the inaccuracy they were taught
