Did the Tailwind projects use the @apply directive, or just plain Tailwind classes all the way? Asking because I wonder how Tailwind deals with project wide sty

Did the Tailwind projects use the @apply directive, or just plain Tailwind classes all the way? Asking because I wonder how Tailwind deals with project wide style changes. With traditional CSS you just update the class in one location, with functional CSS you have to hunt down every location where the class was used.