There's a lot of hidden value in physical contact. I don't think it should be disregarded so easily considering society as a whole became much more distant in recent years.
Bro hug with a friend I haven't seen in a while? Okay. Sweaty hand contact with a stranger? Never.
Sounds like you're unfamiliar with the practice of agreeing to a deal by both parties spitting into their hand and then clasping hands?
There's also the idea of making a pledge by both parties cutting their hands and then clasping hands, mixing blood with each other.