Many new cars have no spare tires. What are you expected to do if you get a flat?

They come with a can of gas/gunk that seals and refills the tire long enough for you to get to a garage. Or they have run flats so it’s not an issue.

I think you’re expected to be part of an auto club (such as AAA), that will come out and fix your flat for you.

In the past if we bought a car with no spare tire, we have purchased one (and a jack to go with it), and kept it in the trunk.

Honda and Toyota all-wheel drive minivans have run flats. The tires require special handling to change and most gas stations and some car dealership (non Honda and Toyota) wont change them.
The minivans rear wheel drive for the all wheel drive goes in the space where the spare tire would be stored.