It has 300 single points of failure, and positioned 1.5 million miles from Earth it will never be able to be serviced like Hubble. There is no present craft that could Take a repair crew to the James Webb, even it they held it in a parking orbit. The only grappling arm is on the ISS, and there is no grappling plate or fitting on the James Webb.
As a project it seems doomed.
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