T doms can tend to look steely eyed. they generally have far less natural mirroring going on with body language, facial cues, etc and very flat affect as a result.
sp subtypes often tend to be more uncomfortable connecting. feel invaded or invasive more quickly.
i just think of it is a necessity at times so you can get the information you need, rather than jumping to conclusions. you also have to push your own self into the conversation too if you want to really relate, which requires visually communicating so that you can embody the message and its context. otherwise it's difficult to gauge the context of the relationship/interaction.