This is quite an odd take on things - you find something pointless, so anyone else doing it for fun must have a problem?!
Hello, I'm your friendly alcoholic. I am officially an alcoholic, I drink, AND I'm officially 'recovered'. Being able to drink moderately was my objective when I went into rehab and, after a couple of backslides, I achieved it. Yay me 🥂
Why would I go to all that extra trouble? Because I like 'drinking for the sake of it'. A lot of people find elegantly-prepared food pointless. I could write poems about it! Then again, I find mountain climbing miserable & boring: some people live for it, and I don't assume they're somehow defective.
Anyway, @CatsLikeBoxes, sorry to hear of your dilemma. I don't believe your guy's an alcoholic by any means, but he is on the way to becoming a 'problem drinker' and probably at risk of sliding rapidly into dependency if circumstances conspire against him. There is reason for caution, certainly.
I recognise the kind of holiday you're describing and, actually, found it rather boring and distasteful even during my heavy-drinking years. I drank three bottles of wine every day, starting at lunch, home or away. I had friends who ordered gin with their breakfast at the outbound airport and never stopped knocking it back until they disembarked from the return flight. I mean, okay, they had a ball but it feels odd to me to make alcohol the focus of your holiday rather than a lubricant.
So, even before my compromised recovery, I wouldn't have relished a relationship with someone who drinks so assiduously. If it's a compatibility issue for me, it's a much bigger one for you. From what you've said (or what you know) he isn't a problem drinker yet. He may never be. It sounds like he's aware of the risk and is careful to be alcohol-free for around half of his days.
This means there's a conversation to be had about that risk, given that he must have thought about it. It could be interesting. It's perfectly true that this is a compatibility issue for you - it's not that you're demonising alcohol or thrusting AA leaflets at him, it's more a question of mismatched priorities.
I think there's a possibility he may agree with you! I really hope so. He sounds like a nice person, and so do you. I'd like to believe you're able to actively improve one another's lives; I wish you well.