That was close. Check your cables

[Submariner]

Considering the 10's of thousands of standard shore power cords in the country and the lack of boat fires or at least the lack of reporting the boat fires, not sure it is that huge of a concern. After watching the youtube video of the install, I would think that if one was lazy and didn't push the plug all the way in to ensure it "clicks", one would have the same issue?

There's been a few Smartplugs that have melted for reasons you cite. Overall, it's about reducing risk while making it easier to use as well. The standard shorepower plug (L5-30 twist lock) is not easy to use and when used incorrectly has a higher risk for failure.

Rod Collins has a really good write-up on the Smartplug.

https://marinehowto.com/shore-power-cords-smartplug-vs-1938/