IMO, in the end it's all about the quality of the original recording and transfer processes in the first instance. Nothing that comes after that can repair damage done at the origin of the recording. Thus, a re-issue of a sonically great LP will typically be great. A re-issue of a sonic turd will be a turd or maybe a little better if you're lucky.
just an observation for comment
I was giving my 20.00 one year old black crows war paint album a spin , it sounds good but a little muddy, then my 35.00 new copy of the rolling stones exile on main street, better. then my thirty year old 2.99 zz top dequello album, sound quality way better on every level. so much for new tech. im wondering if i should even bother with these 30.00 reissues, and just buy clean used.