It’s mostly certain people, who know who they are, who take the thread off at a tangent from the original topic. Initially, there is a thin connection, but soon it disappears. Can you hear differences between CD transports evolves into can you hear differences in digital cables, evolves into differences in interconnects, and from there anywhere else, e.g. fuses.
When people have an axe to grind, they will take advantage of any space and opportunity to grind it.