That's a good distinction to draw, and certainly clarifies things in some ways. The line between the two is somewhat blurry.

Back in the day you're talking about, components were often discreet enough that they could be replaced. Today even something as simple as a capacitor is often difficult to replace on a modern circuit board due to a variety of factors.

Certainly the large companies (Apple in particular) creates legal barriers to buying chips and other components. I think the distinction between availability and open source will be an interesting one to see how it plays out when hardware is involved.