Consider a hypothetical analogous argument against supporting fundamental science made in 1900: What they are working on is completely useless for humanity and doesn't help solve everyday problems... the "and so what?" about the photoelectric effect or quantum theory. Because those people in 1900 could not conceive of inventions like lasers and transistors. They didn't just lack imagination, they lacked total conceptual inability in that context. Just as you are seeming to do here. But of course, either of those two inventions have transformed human society on a level with fire, language, writing and metallurgy.
"Is there a comparable impact on knowing that the Higgs boson is +/- 10^-9 (or whatever) aligned with the theoretical model?" perhaps there is! Might not understanding the fine points of the theoretical model help with something like a reactionless thruster? Could this unlock the door on direct manipulation of spacetime? Assist in devising exotic materials, like say some sort of stable muonic matter and opening up a whole new world of chemistry/solid state physics? The potential is staggering, and by nature is almost completely unguessable until it happens.
If the world followed the lead of yourself or the Sabine Hossenfelders of the world we might never know. The argument that this hypothetical collider can only be used to explore unconfirmable symmetry theories is simply false. The cost of such a facility is insignificant compared to the potential.
My back-of-the-envelope game theory perspective is that humanity should double down on all fronts, at all cost, to push these boundaries. The only impediment is the folks like you, mired in the present and seemingly unable to realize that the unimaginable results are very much unimaginable. Just as those lasers and transistors were 100+ years ago.