The throat mike was standard for all RN helicopter crews through the 60s and 70s, very much because of the ambient noise issues: especially for the crew when operating out of the door for winching, sling loading, landing clearance, etc. The use of the boom mike and a hot intercom rendered speech unintelligible for all on board once the wind got its say!
The ear also had to attune to the vagaries of throat speech, which has significant differences to (for instance) the aluminium death tube drivers talking into their mask or Flyco into the ships system through a boom mike. A throat mike tends to be quite muffled and the high frequencies aren't always picked up, so commonality is a desired feature in order for all crews to understand each other.
Mind you, I had a doctors chit for a boom mike on my Mk 2A which caused all sorts of issues. A story for another day.