I was surprised to find about 10% amber trichomes on each of these 4 plants today. 2 GMO cookies and 2 Purple #1 by Dutch Passion.
One of the plants has some amber trichomes but almost all of the pistils are still white.
some stuff will just keep throwing pistils at end.. the older growth will have more degradation (continued*) if you wait longer... but you'll get fatter colas/yield... bud rot and other microbial risks become elevated too as it backs on thickness. pros and cons.
my preference - ignore late/new pistil growth. i'm more concerned about consistency of the high. rather the bulk ripens in a tighter time frame.