Here’s something else worthy of mention
The Big Bang cosmological model was created at a time when atomic abundances were already known reasonably well. So one cannot really say that the BB model predicted those abundances. One can only say that it was able to retrodict them.
As abundances of key elements like H, D, He, and Li became better known, the BB model and its subsequent versions up to the current LCDM model were continually tweaked and adjusted whenever a disparity arose between theory and observations. Is it any wonder that the agreement is pretty good after decades of model adjusting?
Also, the LCDM model predicted cusped galactic cores, while observations contradicted this by indicating cored central mass distributions. Additionally, the LCDM model predicted thousands of dark matter “subhalos” around galaxies, and yet observations failed to find anything remotely close to this prediction. Then then are the “too big to fail” problem, and the total lack of evidence for any form of CDM.
So perhaps it is not time to break out the champagne at cosmology conferences just yet.