Adult Sheldon doesn't speak with a Texan accent in Big Bang Theory. Young Sheldon is a book worm with "limited social interaction". However, this is a show and not real life. There is not always a real life reason for things happening on the screen. Giving young Sheldon no accent, while his whole family has a strong one, singles out young Sheldon as an outsider in his own family. It's a nice subtle device... |