Apple sells a Thunderbolt 1/2 to Gigabit Ethernet adaptor; I've been using one on my older Macbook Pro for years now. However, I notice they don't sell a Thunderbolt 3 (USB-C port) to gigabit adapter for their newer Macs. Is there a particular reason for this? Are we expected to use third party USB gigabit adapters? I can't find too much information about this.