Hey Mate,
Buds that foxtail are not exactly detrimental, but they are not exactly beneficial either. The most glaring setback is that it breaks up the structure of the herb. Instead of growing into a rounder shape, it tends to sprout out in a more elongated way, ultimately leaving less of the plant for you to use. In addition, this process is a common indication that your plants are not properly ripening.
“Bad” foxtailing involves the occurrence of foxtails due to heat and/or light stress. This often manifests in calyces that form spires and make the bud look quite odd.
However, foxtailing is not always an abnormality.
Good luck and happy trails for the rest of the way 🤞
Servus
OimRausch