Nice concept, yet, this isn't realistic but for a few special cases.

In simple terms, if a company has a continuum of products of a certain category over time, the designs (hardware, software, manufacturing, testing, etc.) are typically evolutionary in nature.

This means that product B inherits from product A, C from B, etc. When product C goes to market, A and B might be EOL. Open sourcing anything related to product C means relinquishing their intellectual property.

Nobody in their right mind would do that unless a unique set of conditions are in place to have that make sense. In general terms, this does not happen.