It’s because alcohol was originally checked by proofing. Proof that it could burn gunpowder I believe. Proof is double the abv. 35% 70 proof. And you do alcohol by volume because it works for measuring the alcohol in a given area. Having measurements of alcohol makes no sense outside of things that need those numbers. I.e. hospitals, pharmacies, doctors, labs, chemistry,etc.
And it has been around long enough as a system that it works. Having a measurement would detract from people buying it, as well as make more complex claims for a demographic that doesn’t look for much.
Tl;dr abv is old standard. People don’t want to look like alcoholics. Numbers confuse drunk people, so less on labels is better.
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