This letter from Sen. Kilgore illustrates how they basically made up what we take for granted:
science.sciencemag.org/content/102/26…
@anecdotal
The six-year board members remove power from the president because there will always be cross-administration people. Truman and Eisenhower were pushing very hard for only a director.
NASA followed the presidential-power-maximizing org structure which ultimately puts us in the situation were in today where NASA makes a new ten year plan every eight years.
Bush (who was another huge player in creating the structure) points out that patents give people the incentive to fund commercialization:
researchenterprise.org/2019/02/01/bus…
It creates a bit of an echo chamber where everybody sees everybody else doing the same thing: