One issue not covered so far is temperature. I am thinking of 2 things here.
First, the obvious one is that if it is a nice warm summer day it might not be convenient to be stranded with a flat but you won't freeze to death. In the depths of winter, in some locations, being stuck with no way to fix/replace a flat can be life-threatening.
The other issue is whether goop can operate at low temperatures. I had one car which was supplied with goop and a compressor rather than a spare. The blurb on the goop bottle gave the operating temperature of the goop and it regularly gets below that where I live, so when I would need it most it could be no good.
I always carry a spare of some sort. Exactly what depends on the car. It may be a get-you-home emergency job. It might be a full-size spare. If I don't have a matching spare then in summer I carry one of the winter set of wheels and in winter I carry one of the summer set. Better than nothing.
Having said all that, punctures are very rare in my experience. Perhaps I am just lucky.
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