Well argued. I would just add... 1 SpaceX's ambitions may be broader than NASA's but their individual engineering targets are not. 2 Private space companies

Well argued. I would just add... 1 SpaceX's ambitions may be broader than NASA's but their individual engineering targets are not. 2 Private space companies wouldn't exist without the public space programs, not just from a technological standpoint but public contracts have been the largest and most dependable source of revenue for private space companies. 3 Though private companies suffer from the same bureaucratic problems as governments they are more flexible because internal fights can always be resolved one way or another by engaged and decisive management (should you find yourself lucky enough to have such management.) Hierarchies in public entities are not always allowed to settle conflicts between subordinates.