If your computer is always running it may never take longer than five minutes. But try to leave your computer shut down for a month or more. Then updates accumulate and it can take really long to make them.
You do have to reboot to use your new kernel after an update. But it’s just a normal reboot, not the whole blocking installation process like in Windows.
Even old blind people who can’t pass driving tests use Uber or Lyft, because public transport simply isn’t safe or suitable enough for them, especially during grocery runs.
You are assuming a car centric city here. In a walking and transit oriented city, it is safe and suitable for blind people to be independent and move by themselves. Only cars make the cities unsafe and the lack of transit makes it unsuitable to use something else than a car.