Any which way you believe about cables, all of this is about pursuing something that is unobtainable. There are limitations and flaws throughout the entire process of audio presentation.
At some point you have to be happy with what you have.
If you can't, and money is burning a hole in your pocket, give it to charity.
You still won't be happy about your system, but maybe you will feel better by helping someone else.
You're absolutely right. Speaking for myself, one nice thing about having gone to RMAF for the past 12 years is I've gotten to hear some of the very best gear in the world, year after year after year. And what I learned very quickly is that there is an upper limit to how good hifi can actually get.
Which is nice, because now I have a solid reference for any other speakers/electronics/wire that I put into my system. I can say that you can get 80% of the way there for a moderate investment and you can get 90% there with a much more substantial investment. To get 100% there requires stupid money. Money that I, personally, am not willing to spend.
And that's why I initially started to DIY stuff. I realized I could get to the 90% level of performance for less than the cost of the 80% retail gear.