But nevermind culturally foundational, if you take away drinking at pubs then they're not pubs, it's immediately more of an impact, and more of an effect on local economies, small businesses, etc. too.

I disagree that age-based is weird: these are people who can't (yet) already do it, so they're not having something (current) taken away from them. It's a lot harder and crueller to say you're taking away something someone likes/does, even if they're not fully addicted to it.