I believe the intent was for the Shield's to have all necessary protections
QuoteI believe the intent was for the Shield's to have all necessary protections No that was never the intention.It is called a shield simply because it goes over the arduino board. No protection is implied.
"Shield" is the name given to anything that plugs in on top of the Arduino. Here's some examples: http://shieldlist.org/
So it's aesthetically named and not functionally named - figures.