What I love about this project is that I had an active worry about its success, very few things in life inspire that kind of emotion. Well done to all involved, a true lifetime achievement. Can't wait for the images!
The benefit: “JWST’s instruments are designed to make discoveries across the spectrum of astronomy — ranging from the worlds and mini-worlds in our own solar system to alien planets circling distant stars, from the supermassive black hole at the center of our own Milky Way galaxy to the edge of the observable universe.” (https://www.geekwire.com/2021/high-cost-high-risk-high-hopes...)
Extremes on the cost/benefit helped create some extreme emotions, I agree!
It seems to cover all sorts of categories, and the James Webb Space Telescope is there (though listed as still under construction).