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Well it saves the manufacturer money, weight, and space in the trunk, win win for them.
The goo will often not work well, or at all, if it is a sidewall blowout. And it makes a mess for the tire changer which will cost you more to cleanup. Unless you are on your way to an important event, I would not even bother with goo and its aftermath and call AAA for a tow. If you can, locate a space saver tire from an older model (with similar bolt pattern, forums are useful) and buy that with a jack/lug wrench.
On modern porsches the tire would not even fit in the Frunk (or interior unless you had no passenger or didn't care to mess up your seats.) It's been my experience with modern tires that the sidewall is so strong you can generally drive slowly for a bit to safety without doing damage to the rim. A cigarette lighter powered air compressor could be more useful unless it's a really bad flat.
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