Hollywood Endings

Have you ever noticed how most movie and TV show phone conversations never end in a socially-appropriate manner? Most of us were taught by some authority figure regarding how to answer the phone. I remember it actually being a unit in my elementary school. The teacher brought out dummy phones and we had mock phone conversations, rehearsing how to answer and how to end a phone call. Later in life, business etiquette lessons stressed how to conduct business phone conversations. In any case, just hanging up on someone was considered rude. Both parties were supposed to verbally indicate that the conversation was over, perhaps by rehashing the main points, thanking the other person for their time, or providing a friendly farewell. Most movie and TV show conversations end with none of this. Someone just hangs up. Is this lazy writing or do Hollywood writers think this is how most phone conversations really end? It wouldn't be the first time Hollywood writers habitually got something wrong about phone calls. If you remember from the 90s, you rarely saw Caller ID used in a movie or TV show. At the time, most landline phones in Hollywood were unlisted, so Hollywood writers didn't use Caller ID in their personal lives. Watch almost any movie or TV show from the era and they'll refer to "tracing the call" to discover the phone number in situations where an average Joe would just look at the Caller ID. Do folks in Hollywood just hang up on people to end their phone calls?