You're just describing evolution. We almost assuredly don't practice most of the habits of whatever sludge we evolved from, regardless of how useful it is to sl

You're just describing evolution. We almost assuredly don't practice most of the habits of whatever sludge we evolved from, regardless of how useful it is to sludge to continue such practices. And if we stop doing things, we will probably do so for reasons just as valid as why our ancestors started them.