Session beers have become common place. When craft beer first got rolling breweries differentiated themselves from macro by making higher alcohol, flavor-forward beers. When craft took off, brewers differentiated from each other by making even higher alcohol beers. At some point they realized though that people don’t necessarily want to drink 9% ABV beers in the afternoon. Thus began craft’s session beer movement.
Most categories have session beers in them now, the least likely of which being the aforementioned IPA. When that’s all people want to drink though brewers are going to make it happen. Check out this article from Aaron Goldfarb and it’s obligatory infographic for a wider variety of options.