Another difference between a typical TV screen and a typical monitor is many TVs will dynamically adjust brightness depending on what's displayed, and maybe other factors. Sometimes this is on by default and you can turn it off in a menu, but I've met TVs where you can't turn it off.

Using a TV which adjusts the brightness depending on what's displayed can be very unpleasant when trying to do computer work on it. E.g. opening or closing a window may cause other windows to abruptly change brightness. Scrolling through a document may cause the brightness to vary.