Bi-wireing speakers

@akg_ca , 
Nice post.
OP, as akg said there is a lot of divergent material on bi wiring speakers.
But, if it didn't do anything, why offer it?
Vandersteen believes it to be a significant improvement. And, using 2 separate runs is the best, most complete way to implement bi wiring.
Just because you are using separate cables doesn't mean your 300wpc amp is going to me more capable of blowing out your speakers.
A 300wpc amp is going to blow out your speaker if you either are over driving the speaker(distortion), or clipping the amp(distortion, too).
If you play music at a reasonable level, you probably aren't using more than a few watts. It is the transients that tax an amplifier to reproduce properly, and those extra 290 or so watts give you headroom to produce an undistorted signal.
B

I recently contacted Vivid Audio and they are moving away from making biwire or biamping available.

According to these articles they’re going the opposite way. And so do others. 

https://hifipig.com/devialet-add-axd-tech-to-their-expert-pro-line-of-amplifiers/

http://designwsound.com/dwsblog/2018/10/devialet-axd/

I follow Vandersteen's suggestion....never had trouble. 

"What would be the advantage of running two sets of cables to the same terminal on a speaker. "

There are no advantages to running two pair of wires to a speaker terminal.  That configuration is electrically identical to running one pair of similar diameter wire to the terminal.