Question: Why do we use "restart" on most worksheets as the top command?

This has always made me wonder everytime I type it.

The first command I always type on a new worksheet is restart.  I don't think I have never done this. 

Is there a reason it needs to be manually entered and how many people DO NOT start a worksheet with a restart?   

Is there a reason to not make this automatic with initial loading of a worksheet?
 

Thanks,

Bill

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