Re: Does Star Fleet not run psychiatric examinations on its recruits?
Being shy, intoverted, is as you say not a mental illness.
As an introvert, I'd agree with this. I think introverts can be harder to read because they don't always broadcast their thoughts for everyone to hear, but that's not a sign of a behavioral problem or mental illness. One of the things modern psychiatry has tried to correct is the idea that because a person is poorly understood means said person has something wrong with them.
"Many things seem clever to an imbecile." --Captain Thelin th'Valrass, USS Enterprise-- "The Chimes at Midnight"