Hi River,
While quad-path HA provides additional path resiliency, the main purpose for the additional cabling is to double the I/O bandwidth to the SAS3 storage stack.
Configuring the storage stack with quad-path HA and double-wide intrastack connections is optional. All-SSD storage stacks can benefit from the increased bandwidth, especially for
for large block (e.g. 64KB) sequential read streaming workloads.