Why is it that we use voltages and watts more often than amperages? 9v batteries, 12v car battery, 1000W Microwave oven. But amperages not so much, even though its “half” of what makes power, A*V=W. What property of amperes makes it so “unnecessary” to be aware of?
Bonus: how many amps and volts does a typical 1000W microwave use?
In a nutshell, voltage incompatibility is generally more damaging than current mismatch, typically in a frightening or energetic manner. Many Americans tourists find this out when they bring their 120v AC hairdryers to an overseas hotel with 230v AC power. If there is only room for one number to be emblazoned on an outlet or plug, it should be the rated voltage, first and foremost.
For current protection, we’ve had thermal fuses since the 1890s, and thermo-magnetic circuit breakers since the 1940s. There are even more fancy transistor-based current protections available for industrial equipment that can shut off extremely fast. In a sense, protection against over-current has basically been solved, in the scenarios where there’s enough of a risk of humans or property.
Whereas voltage mix-ups still happen, although consumer electronics are now moving to automatic voltage detection (eg an 18v electric drill battery charger refuses to charge a 12v battery) and through actively negotiated power parameters (eg USB PD). And even without human error, under- and over voltage transients still happen in residential and commercial environments, leading to either instant damage or long-term product degradation (eg domestic refrigerator motor drive circuits).
It should be noted that a current starvation scenario, such as when an ebike is current-limited per regulations, does not generally cause a spike in voltage. Whereas in a voltage starvation situation, resistive loads will indeed try to draw more current in order to compensate. Hence why current protection is almost always built-in and not left to chance.