I must not have good ears, because homemade interconnects seem to as good or better than most of the store bought ones I have tried.
there could be an open forum for say, car guys. You could have a group of these car guys talking about how they reduced their best lap times by seconds while outlining exactly what they did to their vehicles to lower their best lap times. Another group of car guys come along to tell the first group they are all nuts and that none of their tuning tips work, some even claim to have tried their tips and that none of them lowered their lap times. The reality is, both of these camps could be correct. The problem is perspective and details. The drivers reducing their lap times could be Porsche and Ferrari pilots while the second group could be Miata drivers. Knowing the details of an audio system is extremely important to put anyone’s perspective in perspective.
As to cable length, shorter is almost always better to a point, but if you must have long cables, make them your interconnects and not your speaker cables.