The guru on fuses:

Stop looking outside yourself for confirmation of your own worth/knowledge/reality.  Be your own Guru.  Buy some $20 Create Audio fuses from Parts Connexion and listen.  Then you will know something.  All true knowledge is directly perceived by our senses.  Do not trust what anyone says.....including yourself.  Believe your experience.  More and more my experience shows me that everyone is beautiful and worthy of the infinite possibilities that are right in front of us.  Enjoy every second.  You are beautiful and loved......forever.

Always amazed how different people are able to see or read the same thing and come to completely different conclusions. Here's what caught my eye: 

Of course, this is almost impossible to measure statically. Once you put a resistive load on and a certain amount of power the fuse is going to go up to it’s temperature and stay there and the resistance is not going to change very quickly, so you never know that the fuse is distorting. It only distorts getting up there and then going back down. It doesn’t necessarily distort by the time you’re ready to make the measurements. That’s one of our problems with static measurements. You just don’t know everything that you need to know.

Something I have been saying for a very long time now: measurement ain't all that!

Also this one passage, the lower half of page 6 that OP thought was so good, all it talks about is resistance. 

It's also a really, really simplistic view. After all, he himself says

The resistance invariably rises as the temperature goes up --that’s pretty much the laws of physics

Something you learn in entry level classes, by the way. 

So put it all together, what have we got? The man himself saying it should be obvious there's a lot more going on than we can measure.

Well if we can't measure- and no less an authority than John Curl just told us we can't- then what are we left with? Our ears. Listen.

When we do that it very quickly becomes perfectly obvious there are vast differences between fuses, and even between the same fuse used one direction vs another.  

Go and listen. You will see.

Yes ignore John Curl. Just buy that $150 or more fuse and chances are you will convince yourself it’s worth it and be happy in the end.

The mind is a terrible thing to waste. 🧠🧐

Me, I would probably consider owning any fuse he uses in his products. 

We're pretty lucky in that John Curl is a member of our local audio society and he regularly attends our Friday Zoom Happy Hours. After most of the crowd breaks for dinner we have the Happy Hour after party where John gets a bit more involved in the discussions. Let's put it this way, the man didn't get to where he is today by not respecting the laws of physics and electrical engineering. He does place an emphasis on listening, but understands that you have to have a solid circuit with which to base that listening off of. That involves ensuring the test measurements are up to snuff.

Roger Modjeski was also a member of the audio society prior to his passing. He used fuses from the Little Fuse company in his designs. I've got hundreds of them here to resupply customers with the proper fuses for their amplifiers. To say the least, Roger was not very enamored with the expensive exotic fuses.

Sure you can use your ears but hopefully nothing will blow up or catch on fire while you are listening.

I'm confused. Since when did John Curl have anything to do with designing a McIntosh system for the Grateful Dead? I know about the system of course, it's famous, but he didn't design amps for McIntosh, did he? What was he then, a consultant putting it all together for them?