You are soo Mr. Spock! LOL
To me, a smile sets a pleasant tone for a post which could be taken the wrong way. This is good manners. It is decent and civilized. Like not talking on the cell phone when ordering a taco with extra guacamole. And sauce.
But srsly, a smile can give hope and lift someone up, even on the interwebz where eye contact is absent and cutthroat is usually the key signature.
But: I'll be sure not to smile at you. I hope I don't forget.
Serious cat is serious about not smiling. Srsly.