Who wants to wait for a rideshare when:
1. We're all snowed in but mom-to-be needs medicine/insulin?
1. Its time to go give birth...baby's here early!
1. You have 3 children and equivalent amounts of diaper bags/soccer outfits/bookbags and the schedule between school getting out and soccer practice starting is quite close
1. You get a call, grandpa's taken a turn for the worse, get here bc he's gonna die in <1 hr
These examples are not perfect, they are just what I could get off the top of my head, but c'mon, until we have People-Mover style monorails and/or Hyperloops everywhere, you will need a vehicle of your own control IE ownership.
To assert you can get full control over something you don't own is something I would disagree with.