That extra human readable section is not added for humans. It’s added for SEO. That is, for Google.
It would be a shame if URL text loses its SEO value because it's getting hidden. Slugs in the url are human-friendly and should be encouraged.
People understand slashes indicate folders and directories, even though database-driven CMSes do not use folder structures. They can figure out that they can go one level from from "example.com/cars/toyota" by removing the "/toyota"
It is indeed for humans. After all, the whole purpose of SEO is to show up on the 1st or 2nd SRP for web searches conducted by humans.