I destroy those since going sober. I think it's that carbonation itself has a flavor, and in cheap beer that carbonation was actually the majority of the feel/flavor. Occasionally I'll feel silly buying so much, but then I remember how much I used to spend on booze without batting an eye and grab another 12 pack for $2.85.

That’s good, and just fizzy mineral water too. Luckily the NA market for more interesting adult drinks is growing, so things like fake Moscow mules, Hop Tea, or other mocktails that have interesting flavors are starting to become more widely available and have zero alcohol. Not the same as the real thing, but generally pretty good and better than soda or other sugary stuff.

Depends. Alcohol dissolves things that normally are only fat soluble so you can get an entirely different flavour from common foods (wine and beer tastings/pairings for example)

For fermented beverages the yeast and malt make a pretty unique flavour. Same with hops in a good pale ale or IPA. There's also the body and mouth feel that's hard to replicate without making alcohol. Residual sugars after fermentation are also kind of unique to alcohol since you always have normal sugars mixed in with other foods.