I think the most simple and obvious answer has been overlooked...
Why not?
The incandescent light bulb works and has for years... Now we have LED, CF, sodium, mercury vapor etc.
Its not about a fear of knots, its about speeding up set-up and tear down of camp, IMO.
Not to mention new things are cool, especially one off, hand made right here in the US stuff. You are still free to tie knots if you so desire.
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