Porters and stouts often have dark fruit flavors like dried cherries. You’ll commonly taste coffee, toffee, and nuts. Bold cereal flavors like barley and oats will assert themselves. Like IPAs, caramel is also often a front-running taste.
Years before today, the word "natural" actually meant something. It referred to food that came from nature, unaltered by humans. But as money became the primary concern for food companies, quantity preceded over quality.