That's like saying the 1/2" hole in my floor joists that wiring goes through is "structural failure" on my house.
If the plug holds and the belts don't corrode, I get to use the rest of my tire.
If the belts do corrode, then the tire goes bad, (perhaps quickly) and I don't get to use it, which is back where I started at.
I don't drive on the autobahn, so the risk-reward works for me.
Apples to Oranges. Your floor joist's don't have to take constant road shocks while flexing and hoping that contact adhesive on your tire plug holds onto your tire. I choose Apples...