I quoted what the Swiss Fuse Box guy said on his website here:
After a period of consultation, he replied, says I was correct ("… makes a fair and intelligent argument, and is correct… ").
He then came out with a lot of complete nonsense about macro and micro (who on earth would design an amplifier that made transient demands massively above the fuse rating?) and that they didn’t really know.
The second stage of guesswork/whataboutery was vibration. I quote: “There could also be the possibility that fuse element vibration is at play as well, but resistance is the only measurable phenomenon we can point to.”
The irony is that the $5 Littlefuse cartridge fuses are tested for vibration to a US Military standard called MIL- STD-202, Method 201. It’s on the spec sheet I posted earlier, it involves measurements before, during and after the vibration is applied (for hours). You can read the details here.