There is no "always" in photography. Every setting on your camera is there for a reason—there is a time and a place for it.
Auto focus is easy, which is nice if you're just snapping.
Auto focus is quick, which is important if you're not going to have time to manually focus before the image gets away.
Auto focus can track subjects that are moving closer or farther away, something that takes a lot of skill and experience if you're using manual focus.
Manual focus lets you determine precisely what you want to have in focus, instead of the camera trying to guess and maybe focusing on the wrong thing.
To everything, there is a season…
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