Originally Posted by
canid
Alcohol content is primarily a factor of sugars content over time and temperature, up to the maxima the yeast strain can survive. Some yeasts [such as some bred for baking, and some wild yeasts] can tolerate only a few % alcohol, and some may survive quite high concentrations.
That wines formulations tend to be stronger than beers [which is not always true] is merely incidental. Samuel Adams makes a beer over 20% abv, which is stronger than almost any other non-distilled spirit.