He says that the four ports are all the same, but that is not correct. According to https://support.apple.com/en-us/HT207256 https://support.apple.com/en-us/HT2

He says that the four ports are all the same, but that is not correct. According to https://support.apple.com/en-us/HT207256 https://support.apple.com/en-us/HT207256: "MacBook Pro (13-inch, Late 2016, Four Thunderbolt 3 Ports) supports Thunderbolt 3 at full performance using the two left-hand ports. The two right-hand ports deliver Thunderbolt 3 functionality, but have reduced PCI Express bandwidth."