Fair; I should have said "from the standpoint of the driver." > USB 4 supports Thunderbolt 4 It's the opposite! I hate to get into it as I saw the USB naming

Fair; I should have said "from the standpoint of the driver." > USB 4 supports Thunderbolt 4 It's the opposite! I hate to get into it as I saw the USB naming argument pretty thoroughly enumerated in the comments here already, but the pedantic interpretation is "Thunderbolt 4 is a superset of USB4 which requires implementation of the USB4 PCIe tunneling protocol which is an evolution of the Thunderbolt 3 PCIe tunneling protocol." From the standpoint of USB-IF a "USB4" host doesn't need to support PCIe tunneling, but Microsoft also (wisely, IMO) put a wrench into this classic USB confusion nightmare by requiring "USB4" ports to support PCIe tunneling for Windows Logo.