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I guess it depends on severity of puncture and speed of air escaping even taking out cases of complete blow/large ripping in tire. If it goes to flat in 5 minutes or much quicker, no temporary filling at gas station will help. If i had on average one flat per 2-3 years, i'll better have space saver wheel in trunk for ensurance and piece of mind, if i have no way to predict when/where/how severe i can have flat tyre again, if it will be where roadside assistance can arrive quick enough or not, if waiting for it will interrupt my plans too much or not, and so on. Donut wheel is not THAT heavy to not have that extra ensurance i can rely on, it also doesn't rob one of trunk volume unlike full size spare in AUDM cars, and for track racing it can be removed anyway together with foam pieces with instruments and alikes.
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