Has biwire speaker cabling become "old" ?

Silverline Audio recommends biwiring for all their speakers in their somewhat generic setup suggestions. When I found a used pair of Preludes years ago I found that one driver wasn't working so I called Silverline to see about a replacement (it was a wiring issue so I ended up not needing one) and Alan Yun (the owner/designer) answers the phone...a fun conversation ensued where he tells me the Preludes specifically should NOT be biwired as they're more "coherent" single wired. I tried both ways, and he was right...my conclusion is that it is taste and/or speaker specific, and nothing should be assumed without listening closely.

My guess is that people want to biwire things regardless of how they sound so Yun stuck the posts on to satisfy customer choice issues, or he just had biwire panels hanging around and figured he's use them. I'm willing to bet a VERY small percentage of hifi freaks biamp speakers so I doubt that's the reason. He also warned me to be careful not to lose the jumpers...that was pretty funny.

As someone very suspicious of many tweaks ("special" fuses, magic dots, wire suspension bridges…blah blah), I was surprised at the results  from building a pair of what I thought were way cool jumpers to try in place of the stock gold plated metal bars on my Silverlines. My high quality solid core shrink wrapped well sorted little masterpiece jumpers sounded like crap. Back on went the stock little flat jumpers that are simply better. The end.

It's always better to read and accept the opinions of  experts regarding the sound of your gear rather than listening to the gear yourself and deciding what you like. What you like could be in fact not what many of the experts like, and thusly not good for you or the world in general. The safest thing to do is to NOT listen to your system at all as you could be at risk of enjoying something that isn't actually enjoyable, and that, clearly, is not worth the risk.