590.5 applies directly to Holiday lights ... is that construction?
How about 590.3(A) which says "construction, remodeling, maintenance,
repair, or demolition of buildings, structures, equipment, or
similar activities."
How can you possibly say 590 does not apply to 'general maintenance' when it tells us it does?
That is one reason why I'm a little suprised that GFCI is not required on all 15 or 20 amp 125 volt receptacles. Any receptacle is subject to this possibility.
My opinion - we do not need GFCI protection for some items like refrigerators, freezers, washers, or anything like that that gets plugged in and typically does not move, or is rarely unplugged.
I do feel that continuity of the equipment grounding conductor is very important if you are not going to have GFCI protection however. That is where all the problems start, is when the EGC is lost.
The 5-15 plug and receptacles have been around long enough that they will probably never be replaced but the ground pin breaks off too easily on a lot of cords, and most people have learned that it works without it so why bother fixing it.
If they designed a better plug (as in different configuration) for certain items I feel GFCI protection would not be needed for those items that may require protection now, not so much because the appliance needs protection but because the 5-15 receptacle is subject to being used for other things. But then you have a dilemma with all the existing similar products, and I can assure you there will be all kinds of homemade as well as manufactured adapters to convert them or a lot of original cord caps will be cut off and replaced with a 5-15. Because of all of that the GFCI still looks like the best solution, at least for now.