Good point — though I don't have any Thunderbolt 3 devices or docks, the Surface is limited by not having a Thunderbolt 3 port, because I may buy a device later

Good point — though I don't have any Thunderbolt 3 devices or docks, the Surface is limited by not having a Thunderbolt 3 port, because I may buy a device later, perhaps the LG Ultrafine 5k monitor. We need more compatibility, not less.