That's true; I can't tell you how many bags of flake-food-dust I have in my supply closet. There are never going to be enough fry to get rid of all that stuff!
That said, I do not like pellets, except for large fishes. Grazers and foragers never encounter such a solid, concentrated food mass in nature, and many of them have a difficult time digesting such things. All of my fishes, whether strict herbivores or omnivores, have really long GI tracts, and are very sensitive to digestive overloading. Flakes are more gentle, and the only way to go with such fishes. I learned this the hard way.