You're right. Iteration comes when you plan on building lots of something. If there was a plan to have 100 JWT type telescopes in orbit, then you build lots of

You're right. Iteration comes when you plan on building lots of something. If there was a plan to have 100 JWT type telescopes in orbit, then you build lots of prototypes and narrow down the manufacturing process. When there's only one of something, we see what we have now: years of delays and over-budget because the thing (JWT) absolutely has to work or the entire project is a failure.