Perhaps a comparison of the BB with evolution is useful: Darwin's original thesis contained seven primary concepts, three of which have been falsified and four which have been modified, but remain basically unchanged and unchallenged.

The original incarnation of the BB has certainly been falseified: Without inflation or a similar epic the universe is much too big. I personally argue the reintroducton of the 'cosmological constant' is an admission the Einstein deSitter mathematical formula is no longer consistent with observations, but to most astrophysicists this is a reasonable modification.

The observational data have continually boistered the remaining arguments of evolution. Every time we peer further into the cosmos, the BB has to be tweaked with new parameters. Is the Big Bang a success or a very stubborn failure?

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jwj

It's ok not to know. We should try harder to find out.