Now lets hold a poll - who doesn't use a headset - handheld mike and speaker.
I did my Restricted PPL in 1988 and we didn't use headsets then. All coms were done through the aircraft speaker and handheld mike. Headsets were just about to become popular and by the time I started my Unrestricted PPL training in 1989, our flying school had installed intercoms in all aircraft. Some of them were those messy third-party jobs with wires everywhere with the multi-jacks sitting on the floor. I remember my instructor then was proudly showing off to me his brand spanking new model David Clark 13.4 with flexible boom mike! That's how long this model has been around.