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Based upon my anecdotal conclusions, I think the 5-pin AUS/NZ industrial plug design exists and endures because it was an adopted standard, not necessarily due to a lot of equipment needing the neutral conductor.??

In the USA, I'm sure there's other arguments for splitting 3 phase into single, but electricians seem to tell the story from electricians that the neutral was implemented as a primary way to use one single facility power meter to get both 3 phase and 1 phase service into the building most efficiently.? From my industrial experience, the neutral is also an advantage?in starting large motors (wye-delta starters), but not sure if those advantages have been superseded by VFD tech for controlling starting amps/torque. Your experience for the neutral input to a machine allowing for powering electronics and other single phase systems makes perfect sense, however.

And, correct me if I'm wrong, Mark Thomas, but I believe the neutral leg is always manufactured in the last step at the step-down transformer, while the main power distribution is typically the 3-conductor setup from the power plant. I can have delta power coming in, and a transformer to convert to wye type power with the neutral.