I don't want to tell NASA/ESA/CSA how to operate, but I haven't heard of a single software product that launched 10 years late. Such a product would be immediately DOA because of how fast technology moves. Obviously a space telescope is literally rocket science, so it's nothing like the next popular JavaScript library, but I think NASA could adopt a little bit of the move-fast-break-things mentality. Apparently they're running Python 1.5 on the JWST ffs.

All I'm saying is there's room to improve. JWST would be a monumental success for humanity even if it launched 20 years late.