I put a ton of effort into dealing with suboptimal sources, as that’s the biggest audio chain challenge. The punk/new-wave/hardcore of the 1970s and 1980s is some of the worst technically. But even today there is a lot of stylistic vocal compression and rhythmic modulation (e.g., EDM) that’s not too pleasant to my ears.
See the intro rationale for my 50 track fatigue-evaluation playlist:
It’s not so hard to make a good recording sound good. It can be quite hard to make a bad recording tolerable.