In order to measure things by mass, you need a scale, which involves complex moving parts and needs to rest on a flat surface. Depending on the scale, they may also require calibration or counter-weights (especially if you were talking about things in the past).
In order to measure liquids by volume, you need a glass cup with some markings drawn on it, and you can easily hold it in your hand.
I have a food scale in my house that I use for chopped vegetables and meat, and even with the scale set up and waiting to be used, it’s still much easier to use a measure cup or spoon for liquids or spices.
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