Not sure id this has ben posted but any news if the Studio's USB-C ports share the bandwidth or does each one have full bandwidth
Thunderbolt has a ≈23 Gbps limit for data but the USB-C ports of the Studio display probably share a USB 10 Gbps upstream connection. This is the simplest arrangement for a Thunderbolt dock or display that is expected to also work with non-Thunderbolt hosts.
I suppose it could be possible for the display to include another USB controller to utilize the ≈23 Gbps limit of Thunderbolt, but then it would require additional chips for switching the USB ports for the non-Thunderbolt use case. Maybe Apple made a totally new Thunderbolt controller which has ≈23 Gbps USB controller support built-in but probably not. We'll have to wait and see.
An example Thunderbolt device with ≈23 Gbps of USB support is the CalDigit TS3+ which has two 4 Gbps USB controllers, one 8 Gbps USB controller, and one 10 Gbps USB controller. This Thunderbolt dock uses Alpine Ridge Thunderbolt controller, which does not support connection to non-Thunderbolt hosts.
