Paul F. Dietz wrote:
'Spin-on' technologies occur *all the time*. That's why we
have rockets in the first place -- all sorts of mundane technologies
that were developed for other reasons, but enabled the production
of spacecraft. Why should this suddenly stop? You are proposing
a sea change in how technology progresses, with no supporting
evidence whatsoever.

A perfect case in point would be real time operating systems,
such as QNX or VxWorks. There is a huge market in RTOSs today
spanning a great many industries, including aerospace. It is
that market which drives and pays for the development of RTOS
technology, but aerospace vehicles very much benefit from it.