Because someone is thinking too much?  

I can see a pin one (orientation) difference, but I can't imagine any 
mechanical or electrical reason to change pads because of their shield GND 
connection.  And under an LGA, I'd much prefer just a chamfered corner than 
an oversized homeplate orientation pad.

Not an LGA fan to begin with, ideas like this don't make me feel any better 
about them.

Pete

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