And also, that does not at all mean that the utility breaks down. Back in the day, it was normal for devices to come with schematics. Like, if you bought a TV, the schematic was included. Almost noone who owned a TV could read schematics. But the schematics were still useful to the owner, because those schematics were what enabled you to take your broken TV to any independent repair business of your choice and have them fix it at a competetive price.
You can profit from the wide availability of knowledge without having to learn it all yourself. If there are ten competing car repair businesses in your city that all understand how to fix your car, that is better for you than the manufacturer having a monopoly on repairing your car, even if you don't have the slightest clue how your car works.