2 or 3 pins?

What is the difference and why?
I've seen razors with 2 and 3 pins. I understand that with the third pin (kind of in the middle) that the shank of the blade sits on it when closed but why do this? If the scales are properly spaced there shouldn't be a need for this, or am I missing something?

Thanks for enlightening me on this. I get lots of questions in my mind driving for hours and hours all day, every day. Ha.

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2 or 3 pins?