There's one thing that we immediately pick out as listeners...
...even if we don't have very trained ears and even if we're not very experienced or familiar with the genre:
We immediately notice when something is way too loud or way too quiet.
And we subconsciously notice when the song doesn't feel right, maybe because it's hard to make out the bass line, or the drum groove is just not hitting hard enough, or there's this weird, buried thing in the background that's distracting us, while something else is jumping out too much.
We might not be able to put it into words, but we definitely notice when there's something wrong with the balance.
So there is one skill that we have to learn and constantly improve as engineers and mixers if we want our music to translate well and deliver all the emotion and energy with minimal distraction:
Balancing. Simply finding the right levels for every track in every part of the song and every mic on a every source that we record.
Technically it's super simple, but it's also incredibly difficult to get right. If you get it right, however, assuming that your source tones are good, you're 80% there. Without touching an EQ, compressor or effect.