Not immature. If s/he is going to be client facing at all, taking calls, sending emails, anything, then s/he needs to be able to not cause visceral discomfort j

Not immature. If s/he is going to be client facing at all, taking calls, sending emails, anything, then s/he needs to be able to not cause visceral discomfort just by speaking, or at least fake it for long enough not to alienate clients. I had to work with a contractor (non-programmer) for a while who was like this and eventually our boss got rid of the guy because people were physically avoiding him, and he was co-located with their desks.