The only one of those that you mentioned that is not quite right is suctioning. The newer King's have a suction port on them. Might not be able to do it as well as with ETT, but you can at least do it.
It's a gastric suction port. I suppose you could try to jam a French cath through the hole used for a tube changer, but it would have to be a small fr and you'd have to hope it stayed on course to go in to the trachea.
Another one I just thought of is decrease in airway resistance. I can't imagine trying to suck air through a King would go well...
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