I rarely look at them either, but there is a personal preference. Amber trichomes mean the THC has degraded to CBN which will put you to sleep even in a classic Sativa. Most growers will tell you to wait for the trichomes to turn from clear to cloudy, with like 20% being amber. I prefer less than 5% (zero is impossible as the earlier they form the earlier they will turn amber) and don’t mind a lot of clear ones, as it typically gives a more uplifting buzz, but you can tell when the buds are mature enough to chop by the firmness and amount of dried up pistils. That’s why some growers will chop soon, and others will give it an extra week after maturity. To me the pistils tell more than the trichomes anyway, they also will tell you if something is herming out if you see a section of used pistils early in flower, as that’s where the pollen travels through to make a seed.