Because it seems ridiculous to me to suggest that so/sp or sp/so does NOT want to go deep. I know what that buzz feels like, meeting someone new with that click in place, to want to know tons about them and get to share about me too.
To suggest that "so" is a "stay superficial" orientation is kind of insulting, really.
There's a lot more for me to digest and discuss from the other posts here and thank you everyone for sharing. I need a little more time to process.