You'll never harvest at the right time if you do that. Trichomes are just a piece of the puzzle. People like to think they're being more scientific about harvesting when they say "cut at 30% amber" or something, but without the other harvest signs you'll just end up with premature bud. Harvesting by scoping for some % of amber is mostly bro science and nonsense that keeps being parroted by new growers that hear it someplace else. Read this:
https://forum.grasscity.com/threads/a-guide-on-when-to-harvest.666373/. Once you break free of scopes and learn the true signs of ripeness, you'll never rely on a scope again for anything other than just one tool of many. Another thing that drives me nuts is people who think they can manipulate the high based on trichome color rather than type of strain.