Continuing with my previous post. You hear how early CD's were often cut from masters meant for LP. I don't think there is truth to that.
The claim comes not from listeners...it was the explanation that the record companies themselves offered for why they began releasing remastered versions "now sourced from the original masters". This would the late 1980s/early 90s, and was reported repeatedly in ICE at the time (the go-to newsletter for new CD releases then. I still have most of the entire run of that newsletter, stacked in my closet.)
Whether you believe them or not, is up to you.
The loudness phenomenon unfortunately followed soon on the 'remastered from OMTs' phenomenon, so things got muddled very fast. Whatever supposed benefit came from sourcing from OMTs would pf course be obscured if heavy dynamic range compression or radical EQ was added to the brew.
A CD mastered 'flat' from a LP production tape (versus a mixdown master tape) could be expected to sound not great, since the vinyl-compensatory EQ moves encoded therein -- to make it sound good on LP -- would be *unnecessary* and quite possibly detrimental for CD payback. The CD mastered from such a source would require further EQ to try to 'uncompensate' it, which is not as optimal as simply starting from the actual OMT.