Something For The Fuse Guys ...

Let's say you have 10 fuses in your equipment, now you wish to start tuning, so you change the first fuse, you will buy 3 different choices, so 9 fuses remain original. You will finally select the fuse you like, after that, you will change the direction of that particular fuse to find the best result. Next you repeat this process with the second fuse, (remember, the first fuse may have to go back to the original, as that is another combination...) Now, after tens of thousands of combinations, many years later you may think to have found the best combination... However, sure enough by that time (or earlier) a new fuse will become available, and you have to start the process all over again. For those being into this, enjoy the "tuning" hobby.  A similar process is needed for cable selection, after that the footers, outlets, contact cleaners, and many other variables where you can play with. It will be impossible to live long enough to try out all the variables.... 
Summarizing we can say that some people are in this hobby because of the tuning involved, others are in it to enjoy the music, accepting that yes, if they spent many years of tuning, the result would be slightly better than with the original equipment....(a smaller group of "audiophiles" even try to understand why it sounds different, develop their own theories, which provides entertainment as per the above).... Whichever way you like it, as long as you are happy, never mind. 

Sorry, that’s a ridiculous and absurd approach.

Very few people have 10 fuses but whether they have 10 fuses or 1 fuse, the only approach that makes sense is to first decide which fuse you want based on reviews, testimony and price, whatever. You have to make up your mind. It’s the same with cables or speakers. You don’t have the luxury of trying everything.

Next, you buy fuses and replace your original fuses one at a time - checking each fuse for directionality as you go. 🔜 Then repeat the process to double check each fuse for directionality. The end. It’s not rocket science. 🚀

@geoffkait 

Next, you buy fuses and replace your original fuses one at a time - checking each fuse for directionality as you go. 🔜 Then repeat the process to double check each fuse for directionality.

That's what I was saying indeed. ;) (well more or less)

In addition, I don't think that it is the same for speakers

No, my approach it isn’t what you said. Not at all. Your approach takes tens of thousands of combinations. There are too many combinations. You said so yourself. My approach only has the minimum combinations. Your approach can never work at all.

There is no substitute for thimking.

@geoffkait 

My approach is that I enjoy the music. The time you spend on frantically searching for the proper directions of your fuses, I will spend with a good glass of wine and some good music. It's a choice to make.