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No major commercial airline allows a passenger to put 3 large suitcases in the overhead bins: it's one carry-on bag in the bin plus a small personal item. If I'm going scuba diving, especially technical diving in a cold environment, then I need to fill my carry-on and personal item with the expensive or fragile dive gear plus check two large bags for the bulky dive gear plus whatever else I need for the trip.

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The description is a bit exaggerated, but I regularly see families with a large overhead suitcase + personal bag + secondary bag per person waiting at the carousel. I don't think many of them are diving in the places I go to, but who knows.

You misinterpreted what you saw. I fly a lot and most airline gate agents are quite strict about enforcing carry-on bag limits. They frequently pull passengers out of the boarding line and force them to gate check extra carry-on bags. The only common exception is for medical equipment needed during the flight.

You're replying to the same person that thinks they can dress for -40C with some layers that will easily fit in a carry-on.

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