Computer simulations carried out by astronomers from the University of Groningen in collaboration with researchers from Germany, France and Sweden show that most of the (dark) matter beyond the Local Group of galaxies (which includes the Milky Way and the Andromeda galaxy) must be organized in an extended plane. Above and below this plane are large voids. The observed motions of nearby galaxies and the joint masses of the Milky Way and the Andromeda galaxy can only be properly explained with this "flat" mass distribution. The research, led by Ph.D. graduate Ewoud Wempe and Professor Amina Helmi, is published in Nature Astronomy.
That’s not the case- an incomplete theory breaks down at some point, but it still has explanatory power. BBT has a lot of evidence, and we’ve made a lot of predictions using it that have been proven. Of course, you’re still correct in saying that JWST has shown numerous discrepancies, but that shows that it can be superseded by a better theory- an analogy would be Maxwell’s equations are good for most situations, but QED is the more complete theory that works even when Maxwell’s equations don’t.