Your opinion on burn in

While on the Audioquest site there was a statement on burn in. It was stated that if your equipment was off all the time spkr cables would have to be broken in all over again. Something about the forming of the dielectic. I always thought once a cable settles in that was it. What if your budget dictates you not leaving your gear on all the time(tubes,class A gear). True my tube gear does sound better if left on but I would like your spill on the spkr cable issue. Thanks