The hardening argument seems disturbing to me giving the achievements that SpaceX have done in a short time. Apparently SpaceX is using some sort of redundancy system (<a href="https:&#x2F;&#x2F;lwn.net&#x2F;Articles&#x2F;540368&#x2F;" rel="nofollow">https:&#x2F;&#x2F;lwn.net&#x2F;Articles&#x2F;540368&#x2F;</a>) to avoid all the hardening stuff enabling them to use more powerful and COTS hardware that NASA or ESA.