Ok, we don't want to another LHC as a physics experiment, but what about all the engineering coming out of such projects? From superconductors to data science,

Ok, we don't want to another LHC as a physics experiment, but what about all the engineering coming out of such projects? From superconductors to data science, the LHS has done lots of new stuff. Whether the core science experiments succeeds or fails might be beside the point. There are other outcomes to such projects than pure science answers. One can argue that the ISS hasn't produced much science, but without that space station we probably wouldn't have seen nearly as much progress in lowering the costs of accessing space. The link between CERN and the web is a great example of something that had nothing to do with the core science but was certainly worth more than the investment.