Everything is important, but some things are more important than others.
In my experience, most important are speakers, speaker positioning, listener positioning, and room acoustics. Next is the electronic gear (sources and amplifiers). Far behind are analog signal cables, which tend to sound a little different from one another, but what sounds better on one recording may be worse on another.
Far behind even those in importance are digital signal cables (including Ethernet cables), cable risers, crystals, gongs, CD polish, and so on. Power conditioning makes a big difference to some users but never has when I’ve tried it. Maybe I have good power in my area. I do have a dedicated line into the audio room.
Take a look at Jim Smith’s book, "Get Better Sound," available from his web site, for another view of all this.
So, there you have one (pretty experienced) audiophile’s opinion. I hope it provides a useful perspective.