I ... find that hard to believe, but also someone on the R site said in a "everything is bass heavy" troubleshooting section that the vinyl master has less bass and the record players add extra bass back in to the signal.

I'm really leaning towards Vinyl is just a different reproduction that some people like more than digital. Seems like a similar thing with how some people use tube amps with their digital audio library to cause that "old school radio" warm tone when you crank it up.