I know how to enunciate, speak with a voice supported by my diaphragm, and increase the intensity of my speaking voice without actually yelling. It’s incredibly useful. Virtually no one ever misunderstands me on the phone. I can have a conversation in a loud crowded place. I’m actually fairly conflict-averse, but when I need to “switch on,” I can usually short-circuit people’s inclination to argue by using a more focused voice.

Everyone should take a decent Acting 101 class where they teach you these skills.