What is your experience with the law of diminishing returns ?

I think that the issue is in large part, how much and how do you want to teach your ear/brain mechanism to listen for?

Are you teaching your brain to be happy, or are you teaching it to discriminate among cables? At a certain point, sure, you are becoming more and more sensitive, but to what end?

The law cannot be applied if you got the wrong component, including cable, regardless of price.
The system doesn't have to be high end for you to hear even small differences, but it has to be good enough and very sensitive.
No experience or "brain teaching" is needed.

First climber: Isn’t this something?! Here we are sitting on the top of Everest. What a view!

Second climber: Yeah, the view’s OK but we’re only at Base Camp. ⛺️

"law of diminishing returns" = wallet pain

Just wanted to clarify how I interpret "diminishing returns". Ergo, discussing generally a nebulous supposed universal phenomenon called "diminishing returns" with a subset of the population having a wide socio-economic distribution is fruitless, imo.