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Regarding the magsafe2.

I love the T-shaped more due to there's more than 1 orientation to plug the cable. And MagSafe supposed to be easy to disconnect to avoid pulling along your MBA if somebody trips over the power cord. I thought this what Apple advertise about MagSafe.
 
I believe the only reason they had the L-shape was because of the first Air. It had the normal magsafe connector angled down which didn't fit. They probably tried to make it work but failed so much that they went back to the connector that does work properly: the T-shaped one.
 
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