I do it when the plants are midway through flower (weeks 4-5) and already have frost on them, to avoid touching the colas. The leaves that I’m shearing off are the ones deep inside the buds that I can’t pick off. I’ve always grown SOG and basically do the same routine to all my crops and haven’t had any problems yet.
I’m probably wrong… but my way of thinking, is that the colas are already covered with green plant matter to absorb energy, and really don’t need the big fan leaves that are blocking all the precious light and air flow. Maybe some of the energy keeping the fan leaves alive is directed to growing the buds.
Who knows!!!