We are masters of gleefully enjoying the here and now, but that doesn't mean we don't have a trove of inner thoughts, feelings, and ideas.
I think the meaning of "depth" is as subjectively defined as "love" by most.
Even a sociopath can tell a person that they love them.
And on the same note if an overly complicated person with poor communication skills accuses SPs of not having any depth, maybe that is just a reflection of their own excessive complexity?
S/N differences here can play a big part in things.
I know I don't feel the need to talk alot, but my wife feels alot better when we do, so I acccomodate that. The fact that makes her happy keeps us both happy, and because I was willing to discuss things that were on her mind "in depth" WHEN she wanted to, it allows her to then cut me loose to be my happy-go-lucky goofball self again for awhile until she wants to talk again.
Know yourself, know your peeps, and keep your tribe together.