George Clooney is a famous actor who is also considered to be sexy so his SMV is through the roof. If I had the same SMV as George Clooney, then a smile could add or complement the already established charm. You may as well say be a world famous actor and have lots of money and fame to do what George Clooney does. Yeah, most celebrities aren't crying incel.George Clooney is always smiling. Isn't it the Sosuave credo to do what he does?
Smiling can enhance or make you more approachable if your SMV is already high to begin with. If you have a low SMV, no SMV, or too DLV, then a smile will just look weak, or that used car salesperson smile.
My own experience, in many non-verbal encounters with women, a smile makes them look away from me very fast. It almost feels like an instant non-verbal rejection. I don't like feeling allot of non-verbal rejections in public when I'm going through my day to day routine. I don't need to be reminded that I'm a non-Chad or ethnicel or whatever, so I'm probably going to smile less or not at all at most women unless I'm in a mode that I want to increase my emotional exposure out there at large in that type of way. I have no need to want to smile at men. The only girls that may smile back tend to be too young or in High School and I'm not after jail-bait.