That's a fun analogy to think about. One side of it holds up: People don't know how to pop their hood now because they don't need to.

But on the other hand, cars before the 1990s were infinitely simpler to grok and to fix than modern vehicles. The learning curve was much gentler, and really no specialized knowledge was required. Changing the timing on your engine was easier than putting together an Ikea cabinet. Now it requires specialized equipment.

The opposite is true of computers. It has never been easier to snap together a cross-platform app to do almost anything than it is today. Friendly scripting languages, APIs for access to every kind of sensor and data imaginable, and devices fast enough to run terrible code at reasonable speeds. Almost everything you would have had to do from scratch hand in the 1980s has been done for you; a huge amount of coding now is just plug and play. And basically everyone in the first world has access to the necessary equipment to write their own code.