..for video/audio calls and other similar communications is heavily encrypted endpoint-to-endpoint VPN traveling though ports that won't get blocked.
3DXpoint is not NAND flash. Its leakage characteristics (unpublished) would be likely different than flash or RAM.
...into a cheezy three hundred dollar X-Box and you're asking for trouble
T3 has only 4 x lanes (x4) of PCIe gen 3.0 ( and 2 slower lanes ), given that most discrete GPU adapters want to be in a x16 slot, it suggests to me that external GPUs will be crippled in PCIe connection bandwidth. However, I assume the beautiful monitor will accept the 4K DP over T3 to give you great performance for on-system GPUs.
the following connectors embedded/extensible and accessible with dongles - power, 2 X Display Port 4K , multiple 10GE connections, as many USB 3 as you might want as well as extension of the system PCIe to even allow external graphics adapters (Although I think the internal Core i7 Skylake graphics will be pretty good) and huge amount of direct connect NVMe (direct to processor cache) external SSD drive support. That little USB-C port is why you don't need any other ports.
Put not your trust in money, but put your money in trust.