I 100% agree that trichome color is meaningless as when to harvest,many strains will never turn amber,some strains will only show an extremely low number of golden color trichs & those have to be searched high n low for.
I have never used trichomes as an indicator to harvest,i look at new pistil & calyx development as well as bud growth,buds will exibit a 2nd growth spurt at the end of their cycle,once i see new calyx & fresh pistils forming on buds that are at the end of their cycle i then inspect the plants.
Using the plants 2nd growth spurt as an indicator i then look at the pistils,once i see approx 70% of the pistils have turned red i check calyxs,i look for tight calyxs on the bud that have lost their ability to recieve pollen,once i see those things i chop.
The only thing i use a microscope for is to check for mold & mildew,i have hand scopes as well as a powered table top microscope that magnifys from 10x to 10,000x & magnification dont matter,trichome color is the worst indicator to harvest that could be used.
High times has published several articles on this subject,the classic strains of indica & sativa have been altered so much over the last 10 years that some strains will never have golden trichomes,its a genetic issue not a skill issue,some strains wont have golden trichs if you wait 300 days.