Has biwire speaker cabling become "old" ?

I just read the Vandersteen website "faq" on biwiring. Very informative. 
Thanks for your guidance! 
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New to the conversation, (actually just listening in).  I'm no expert on the subject that for sure. I would agree that all manor of connections would make changes in the sound. Full disclosure, I run Audioquest Gibralter single biwire. Also switch off with Nordost Blue Heaven Leif with Norse Jumpers. I like them both but the AQ has the edge, for my system. 

I'm finding humor in the fact that what ever way we decided to connect our speaker cables, we still end up hanging them on what are usually cheap binding posts. And who knows what cable is connecting my paradigm binding posts to the speakers.
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So much info to process.  I'm certainly a novice compared to the folks in this discussion. It appears that my single biwiring may be causing a phase shift according to Nordost? According to Audioquest,  they recommend the best solution for biwiring is two separate identical runs of cables. However they still offer single biwire options on their cables? Has anyone heard from Mr. Cardas regarding this matter?

I'm going to do a true biwire with two identicle runs of cable. Can I get some suggestions on brands and AWG?
Levinson no.334 
Paradigm Reference studio 100v2
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