@tonywinga ... Interconnects: I am using all XLRs so I cannot speak to single ended designs. When I upgraded my cable from preamp to amps the bass changed completely. I thought it was great before. Suddenly, the clarity was like crystal. What I thought was a kind of fuzz in some low bass guitar notes tightened up so that now I can hear the strings. It was a startling change.
And 3rd down on your list too. Some try it, some don’t - yet strive to debate it more. Hilarious posts by those debating something they’ve never actually tried before.