The main reason is wildlife or sports photography if you use auto continuous focus it will use these focus points and allow you to track the action as some action shots you cant predict where the subject will be or will move to.
Like you say the centre focus point on most camera are the best and re framing is usualy best used for composition although even that is a debate lol.
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You cant fool all of the people all of the time, some of the time all of the people will some of time but not all of the time as some of the time all of the people will some of the time but all of the people will not all of the time  !!
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