The main advantage I have found of bi-wiring is the maid occasionally deep cleans the house and somehow manages to unplug very secure connections.
She pulled one of the negative cables to my B&W 800 out and I didn’t notice for a week. Ran fine.
Electronically, it does nothing. I bi-wired because I have a giant spool of 12g pure silver wire from a military aircraft rebuild (they use silver or silver tinned copper for fire reasons, apparently). And I enjoyed making it. My daughter liked braiding it, so we talked as she did that.
I also may jump to quad monoblocks.