Very real. Cars can be on their phones 6-10 car lengths behind another but if one signals and changes they close the gap and honk. Humans are curiousThere are plenty of times I don't use the turn signal on purpose.
Like when changing lanes in busy slow moving traffic on the freeway. I want to be able to cut over to the next lane without the driver seeing me signal and nudging his vehicle forward to close the gap, preventing me from getting in front of him.