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Not quite Peter, RPi 4 will boot and work with less than 3A. The early versions of the RPi 4 had a design fault (incorrect pull-down resistors on the USB-C socket) and would not work with some power supplies even though the power supplies were more than adequate. Maybe that is the reason why yours would not work with a smaller power supply.
The link I posted above is by the RPi Foundation, i.e. the people who design and make Raspberry Pis. They say that 1.8A is the maximum power used by the RPi 4 (without extras). Interestingly you don't even need the recommended 5.1V as the voltage has ±5% tolerance. The undervoltage warning icon will show only if the voltage drops below 4.63V.
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