The grounded metal chassis would provide plenty of protection.
Now take something like a toaster in a kitchen. A kid could stick a knife in it and be shocked. A GFCI would protect the kid.
Or a hand mixer with a frayed cord. Someone could touch a bare wire.
The danger is with small appliances, especially handheld, which can be plugged into outlets. Those outlets should all be GFCI.
Another example is an electric range. No need for a GFCI. No one is going to plug anything else into that outlet.
Source: http://www.diychatroom.com/f18/refrigerator-gfi-circuit-132312/
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