Cape Town has some of the dodgiest roads in South Africa, there's many roads I have to drive on that I would absolutely sht myself if I had a break down on, being stuck without a spare in those areas could be very sketchy.
To be fair even if I had a spare wheel I would always default to using tire inflation products like Tyreweld rather than the spare to minimise time spent stranded and exposed, then go to a tyre shop and have the puncture professionally attended to, the spare tire is only if there's an outright tire loss from road debris or similar which is an extremely rare situation but it can happen.