I think the source of my infos for that particular affirmation is Alan Watts and a post from a Japanese buddhist monk. I really don't know about Tibetan monks, and A.W. is entertaining but far from trustworthy. So you should check this yourself if you want the truth. Maybe it really does apply only to western mystery traditions and some Japanese buddhists, and some pople over-generalized this, I don't know for sure.
TIL - I'd just never come across it before, and I've listened to a fair amount of Watts lectures over the years. Been a while since I read any books of his, I'll keep it in mind, he was very knowledgable about these kinds of things. The Japanese did make Buddhist practice much more a part of daily life.
