The definition of a Shoteh does not change over time but the indicators definitely can. A Shoteh is not someone who does foolish or stupid things. It is someone who is mentally incapable of understanding or functioning around people. A case-by-case basis would probably require a Rabbi ruling on the advice of a psychologist.
A Cheireish that can neither hear nor speak in today’s day and age has been a tremendous argument between the Poskim since the mid-1800s. There are valid arguments and opinions on both sides.