There was a recent HN thread where I pontificated that a twin JW telescope could have been built and launched at 10% of the cost of #1. One of the (vehement) arguments against this was there weren't enough things to look at.
I wonder why you were downvoted. It's absolutely certain that all the big telescopes get way more proposals than there is available observation time. And not all the proposals that get rejected are of low quality.
Everywhere the JW scope points, even at areas thought to contain nothing, a lot is discovered. Given that it looks at the sky through a soda straw, there's no way that one machine could survey the universe. A fleet of them would be needed.
I just have to shake my head in amazement.