I have never heard anyone say bi-wire sounds worse and it is not BS, but it is a matter of how to best spend your audio cable budget.
I have several pairs of speakers and sometimes use single run of speaker cable (with improved jumpers) and also use double cable runs for bi-wire (which sounds better than internal bi-wire, but expensive option)
I think in many cases you will get best sound from just spending 2X as much for better single cable vs double cable runs for bi-wire.......but this is not universal statement for all cables/speaker combos, just my overall impressions from experience.
I have several pairs of speakers and sometimes use single run of speaker cable (with improved jumpers) and also use double cable runs for bi-wire (which sounds better than internal bi-wire, but expensive option)
I think in many cases you will get best sound from just spending 2X as much for better single cable vs double cable runs for bi-wire.......but this is not universal statement for all cables/speaker combos, just my overall impressions from experience.