With respect, I cannot see any reason at all why everyone should know about either chokes or how to drive a manual. Only some 6% of new vehicles sold today are manual, and these are all “market niche” cars. And the last car I had that had a manual choke MIGHT have been my '61 Beetle, and I’m not certain I remember that correctly.
If one chooses to drive a manual but needs a family car, he/she will have a hard time buying one. His/her choices will be extremely limited. What’s the point in knowing how to drive manuals? It’s sort of analogous to learning how to fasten high-buckle shoes. Except in the world of stage costumes, high buckle shoes are nonexistent.
Why would anyone need to learn about chokes? They don’t exist anymore except on farm implements and snow blowers. They’re irrelevant to driving.
There are already many things that car owners should know about vehicles that most don’t including tire pressures and vehicle maintenance. I see no reason for them to have to know obsolete technologies.