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It depends on what's useful to know.
A microwave is a heating device. It's not useful to know you're using a 7a microwave on its own. Is it 120v or 220v? What's important is the wattage, as an indicator of how much heat it can put into food in a given time. A 700w microwave is going to take longer than the instructions say but could be a 3.5a euro oven or a 7a north american oven.
With lights, wattage ignores the change in voltages as well. But it relied upon the tungsten incandescent being ubiquitous. The socket type defines the voltage, so you just want to know if it's a soft 25w reading light or a 100w for a garage bay. But now, with the prevalence of fluorescent and then LED lights, wattage has become almost irrelevant. They usually list actual wattage in pale text and "incandescent wattage equivalent" in bold. I'm happy to say I'm finally seeing bulbs state actual lumens now, which is what really matters to the end user. LED lighting is now the least of your electric bill worries.
With a car battery, you're seeing the options in a later stage of market uniformity. Cars used to very commonly have 6v systems, so the 12v system was distinct. Large trucks use 24v (though I think with dual 12v batteries). But for you buying a car battery, just about all passenger cars are 12v. It's a specific size like "group 65", so it's a 12v of certain size and terminal placement. You do have some options for amperage, listed as CCA. You can't give more amps to the starter, but rather the battery lasts longer per charge and drops voltage less when under load.
But, you will actually see amps listed on power tools. I guess they traditionally had very little export, so the voltage is constant for the market. You can compare amps and take a good guess how two saws will compare. Even still, many tools now list actual specs like rpm and torque