It's not BS. It is documented. Mono was the format for pop music. The stereo mixes up until around Sgt. Pepper were done quickly by junior staff. George Martin and Beatles mixed the mono versions. The book on the Beatles in the studio documents 6, 7, 8, 9 mono mixes of a tune until everyone was satisfied. By contrast, five tunes from Beatles for Sale were mixed for stereo in a in a single half-hour session. You can like whichever versions you choose, but it is a fact that mono versions are the ones with everyone's input, until the White album, where the stereo version was the main one.