I personally would not buy a vehicle without the specifically designed storage space for a spare tire. I have bought a new vehicle and had them only include the spare wheel as I knew I could purchase the tire cheaper elsewhere.
In 3-ish decades of driving I have only needed the spare on a personal vehicle once and I am glad I had it. The sidewall blew out due to me foolishly hitting a curb and the tire being dry-rotted as it sat for about three years while I lived overseas. I have had many, many tire punctures which required me to stop though-well into the double digits. I carry plug kits and an air compressor and it handles the problem.
This was one of my more recent ones. 530 in the morning, felt it go in the tire and then the obvious out of round issues. 15 minutes after stopping I was back on the road after double plugging the tire. I know if I had to wait on AAA or my insurance company's roadside assistance it would have been much longer. That tire lasted another 15K miles before I changed the set on their regular interval.
One of my longer repairs was when driving through Birmingham, AL on I-20 and one of those stupid black rubber bungee cords with the silver hooks came off a tow truck to my front right. It hooked right into my front passenger side tire and beat the heck out of my front fender before ripping out. I could easily hear the air hissing out. I pulled off the highway in a shady part of town, put the Glock back in my holster, repaired the tire, and was on the road in less than an hour.
BL--the spare came in handy the one time I NEEDED it. The plugs and air compressors have put me back on the road much faster than the spare would have.