Measuring water on my rice cooker means putting the inner bowl of the cooker under the tap, opening the tap and then closing the tap when the water reaches the correct line etched inside the bowl.

Right, but let's say you go on a vacation and want to make rice but forgot/don't have access to a rice cooker. Now you're trying to remember "is it 1.5:1 or 1:1?" while also hoping that you don't burn the rice on the bottom once you remember "wait, it's actually 1.5:1; damn."

I like the pasta method since the solution would be "add lots of water into pot; throw rice in pot; boil 10 minutes; enjoy."