> lack of ambition so severe it borders on criminal

I'm not sure what timeline you're thinking about, but JWST was launched pretty recently and it's pretty ambitious. But more to the point of my earlier post, NASA's "lack of ambition" is probably directly attributable to the "small government" people who penalize ambition in the public sector and praise it in the private, government contractor sector. The incentives to be ambitious in government are perverse when every "failure" is scrutinized and condemned by people who want government to fail so that they can justify taking public money and dumping it into private bank accounts.