Sometimes I need auto focus.
Sometimes I need bracketing that I can vary the size of the bracket.
Sometimes I need to bracket on only one side.
Sometimes I need to shoot a burst at a once in a lifetime event when failure is not an option.
Sometimes I need an automatic camera when I am on vacation and do not have the luxury of being able to slow down and shoot right at that time.
Sometimes I want to use fully manual non-battery operated camera. Then I can select from my Hasselblads or 4"x5" cameras.
For the first five I have an N-75 and an F-100.