I'm the daughter, granddaughter, niece and cousin of alcoholics and other addicts.
Before I was born and indeed through my early childhood my dad "only" drank at weekends but I've learned that he mainly didn't just have one or two drinks but would get drunk.
I have a lot of experience with alcoholism and problem drinking. It doesn't start with immediately drinking loads or frequently.
As I said before it's about the relationship with alcohol, how it's viewed and treated.
Eg your own attitude - going to the pub doesn't mean you HAVE to get drunk or even drink alcohol at all.
I used to be a very sociable and outgoing person, loved going to pubs and clubs (I'm currently housebound through ill health) but I was never a big drinker. I'm the type that was first on the dance floor, last off it, chatted away to new people quite happily etc but I never needed alcohol to do so.
I didn't say he'd be a shit dad, I said (truthfully) that being a parent requires much sacrifice, not getting drunk is NOT (or shouldn't be!) a great sacrifice!
Parents need to be relatively alert at all times in case of any number of parenting reasons from bad dreams to medical emergency.
I'm not saying no drinking at all I'm saying sensible, healthy levels of drinking and if I may say you seem oddly defensive at even the suggestion that you both have unhealthy and potentially problematic attitudes to alcohol.
Being a parent means making good healthy choices as much as possible right from the start.
Personally I don't agree with "drunk till it's pink" either. By the time you're getting a positive pregnancy test you could be several weeks along already, and while alcohol may not be a major factor in early loss, it can be a factor and having lost 3 myself, the 1st an unplanned pregnancy, I just felt I didn't want to take the risk and have the possibility that if something went wrong I'd be worrying that was why.
You can't control everything, but you can control this and alcohol isn't a necessity. I think there's also some evidence alcohol can affect sperm and conception too. So if this is really what you both want (a baby) seems like a no brainier to me.
It's also just good sense to be in as good shape as possible for conception and pregnancy in order to make things as easy as possible for yourself.