Two things: 1) The article is amazingly low on specifics besides "to uncover the Higgs Boson's secrets" 2) The only thing to agree with is what Sabine Hossenfelder says (as always): it costs way too much without any significant scientific potential. Meaning, there are not enough viable theories to prove on that thing.

Sure, people who will be getting paid from those $21B of public money are saying: "Another one! Even bigger and faster! That project will be definitely worthwhile!"