Ghost,
I agree with you on the need for better definitions.
For example, the def. of a receptacle is "a contact device installed at the outlet for the connection of an attachment plug".
One could argue that a bath exhaust fan has a receptacle within it. However, if that were the case 406.8(C) would forbid it no matter if it were GFCI protected or not to be installed above a tub. I don't think anyone would argue that they cannot go above a tub with GFCI protection.
I personally feel that a shower light SHOULD be required to have GFCI protection even more so than a bath fan. Couldn't you just see some Darwin candidate have a light bulb blow out in the middle of a shower and yell to his wife to pass him a new one.
