Photoshop is not to hide what you're incapable of but a creative element in your work of art, a tool in achieving your vision. You want others to see what you want them to see, and sometimes it's a little different from reality.
Photography is a work of art. It's what you want to express in your creative ways. No camera can produce an image that can faithfully translate the beauty as our eyes see. The question becomes how to keep a balance between reality and creativity. It really depends on what you are trying to express and it's a very subjective matter.