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The numeric value only applies the same size to matching CSS, and varies in effect between epub and kepub. The ebook CSS body text surprisingly isn't always 1 em (=12pt). So the numeric value would just be clutter. Move slider and tap + or - till it looks right if it looks wrong. Only needs done once for a book. With paper you are stuck with whatever the publisher decided.
Also the same 1 em (=12 pt) is a different size for different fonts! Getting say some Sans text in the body to look the same size as the main Serif text is challenging for the paper or ebook designer/format editing person.
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