"Also, not being late if you have an engine issue or get a flat tire." How does uber prevent that? I suppose with a fleet of cars, another could pick you up,

"Also, not being late if you have an engine issue or get a flat tire." How does uber prevent that? I suppose with a fleet of cars, another could pick you up, but you're still going to be late (just not as late) (edited to add, and on the frontend, I can guarantee that about 45 seconds after leaving the door at work, I'll be starting my car and moving out of the lot, how does uber guarantee that a car will be ready to leave for work within say 15 minutes, so I'd have to burn much more total commute time to make sure theres a realistic chance I won't be late. TLDR is the std deviation of a rental is going to be very large compared to an owned car.)