On retired tire engineer, Roger Marble's RVtiresafety.net blog, he quotes NHTSA, Goodyear, Michelin & Bridgestone Firestone as all saying it can be done
*IF* the correct procedure is followed and the puncture is less than a certain size. He discusses the issue
here.What is the average un-informed driver out there supposed to do when they pull into a Les Schwab and they tell you they can plug it for free and it will be fine or you can pay maybe $300 for a new one. And you could have to wait a day or longer for a matching tire to arrive.
Maybe they need to bring back inner tubes and be done with tubeless. :)