What was the great innovation in the Apple I? The fact that it came in a plastic case, with all the electronics hidden. That is what distinguished it from the Altair, or the various kits peolpe were selling. It turns out that you can't sell "user friendly" without the plastic case. There's no explaining this to people who think Apple was dumb. There's no need to explain it to Appleheads.
I worked in a couple of the first personal computer stores in the late 1970s. We sold everything *but* Apple. We tended to sell computer brands like Southwest Technical Products, IMSAI, and Cromemco that demanded a lot of user knowledge and intervention. In other words they were primarily kits
but for an "added fee" we would build them for the customer. But there was no real documentation beyond schematics.
I suspect that this was because the owner of the store was a EE and believed that users should also be enthusiasts and adopters.
The key marketing innovation of Apple computers is that they transformed what was a messy electronics hobby niche into a simplified, easy to comprehend package. You had business people back in that time period buying Apple IIs and then throwing Visicalc onto them. With our store's stuff every business need required custom hardware or a consultation to determine which package would fit the customer's needs.
Many customers would enter our store, we would spend a ton of time with them explaining how things would work, and they would walk out with a look of terror in their eyes. Especially when it was married couples coming in - the women would axe the whole idea even if the husband wanted the system.
But the other store in town that sold Apple II's had fantastic prosperity compared to us and gangbuster business.
I never really got all of this and the geek centric nature of our "customer profile" that killed the store's chances, until a few years ago. I think the owner was too wrapped up in being a geek to get it.
So Jobs understood this 5 years before everyone else in the PC industry did.