Importance of power supplies, cables and fuses in an audio chain

Not to clog the Berkley thread, I do have some follow up which you may be able to help me better understand or know what I am looking at. I picked up this HDPLEX Linear PSU a few weeks ago, what appealed to me was the four outputs and of those two the adjustable voltage feature;

Looking at its internals, it doesn’t have much going on like the Keces you referenced;

Was I sucker for wanting one device to power four different components?

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