A nice advantage of PCIe switches is that device-to-device transfers are required to be supported. Many/most PCIe root ports don't support device-to-device tra

A nice advantage of PCIe switches is that device-to-device transfers are required to be supported. Many/most PCIe root ports don't support device-to-device transfers through the root port. So if your use-case requires PCIe devices to talk directly to each other without involving the root port, having switches is super beneficial.