I have never said anyones system in not revealing enough to show differences in cables because I have always heard them and my system has not always been near the level its at now - it used to be pretty awful for a very long time. However I do know that my poor setup skill and lack of understanding and knowledge at the time would have definately hindered my testing of the cables at the time and the kit leading to me making an incorrect judgements and decisons. That I know for a fact.
However at a point there becomes a level that is too low - using laptop speakers to listen for changes in bass in a recording is clearly no good. Hence the suggestion for people to use somehting everyone has a good smart phone - that is accessible to everyone.
Then a pair of headphones these can also be of too low quality to assess sound quality of a recording hence my suggestion to use what I use which is not expensive but it will be the same for me as you, because its headphones and room acoustics, quality of this and that are not hinderances to the end result.
I am just suggesting common sense to get a constant result, nothing more.
Trying to get people to guess when I made a change is a pointless exercise, thats not what people do in testing, its not what people do in Blind ABX testing either. The listener is always made aware there has been a change what I do is no different to that.
The difference in my videos people can listen relaxed in their own environment with no pressure to get it right or wrong or be judged, on headphones they know the sound of and a source quality they know the sound of.
They can enjoy the experience and hopefully get somehting out of it and I think for the majority that is exactly what happens.