Weed for example, doesn't have neurotoxins but do we want the youth to be addicted to? Or alcohol is legal and sociable accepted, the amanita is very underrated (don't do it)
Coffe addiction cause dementia later in life, and if you don't have the substance it can break your will.
So what I mean...
Never heard about subutai, I don't doubt your word, but if he has done something out of the ordinary like gengis khan did, maybe more people would know about him also?