Even more accurate is to say that he paid the salaries of a large number of animal "house workers" hence their catchphrase "It's a living!" They all earned their living off of that one guy's income
Plus being able to drive implies at least some degree of literacy
Unless Fred was raised by some of those middle of the woods car wizard redneck types that are dangerously close to keeping their vehicles together and running through Waagh energy
On the one hand, you can read it as a parody of late 20th century life - like, haha imagine a caveman clocking into work
but on the other hand, Flinstones and its far future counterpart Jestsons kinda suggest an inability to imagine anything different. Automobile-ized suburban development frequently gets presented an the human 'default'. As though we just default to this, rather than it being one of many ways cities and society could be organized.
I tried watching the Jetsons last year and it was pretty painful. The story moved really slow, the mother was claiming to be overworked pressing a button. Everything was a mildly linear improvement from the 1950s and it had very old ideas. It did not age well