Why is alcohol measured in ABV instead of the size of an actual measurement, like they do with marijuana products?

Question

Why is alcohol measured in ABV instead of the size of an actual measurement, like they do with marijuana products?

In:

Answer 1

Taking a stab at it, but it probably has to do with the fact that most edibles like that are expressing mg per serving versus a bottle of alcohol which can be poured in any quantity desired.