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I had a remote relay box: 8 channels of power control, so I could at least power cycle machines from remote when all else failed.
I actually ended up not using it much at all, it was a nice security blanket, but the last time I decided that I wanted to power cycle something was about 6 years ago, and at that time I realized it had been over 3 years since I had previously used it, and that usage was more of a “let’s make sure this thing is working like I think it should” test.
For clarity, I have done it myself - plenty, but not just on Unix boxes.