The only thing I can think of is that they must sneak under the Fence somehow because they can be used at lower wattages and it is for a relatively short period of time. I just think that it's a matter of the manufacturers wanting to constantly come out with new (and "improved") products and testing the limits of the code. They kept taking an inch, and another .. and another ...........
I think they should use their Imaginations to come up with different styles, colors .. Attachments maybe?
and stop pushing their luck and ours.