Not sure why companies fall at the last hurdle after doing so much right to produce a great looking product.
Their product page does very little to explain the features available with WiFi and Bluetooth.
I've downloaded their user manual, it's a 28MB pdf which my computer struggles to open and instead of normal pagination it's a very wide document which makes it difficult to read.
What I can see is the WiFi is used for OTA (Over The Air) firmware upgrades, on startup it connects to the companies servers and automatically performs an upgrade when new SW is available. It looks like you need to download an app to your phone called ESP-Touch to configure the WiFi settings of the device to connect to your network.
The Bluetooth is just an input source, some devices allow you to connect Bluetooth headphones as an output but not this device.
You can connect USB-C and USB-B at the same time. The manual is a little confusing here as it clearly says you can switch between the 2 inputs but also says "When both USB-C and USB-B are plugged in, USB-B is the default."
Looks absolutely stunning but maybe a newer chip like the ES9038PRO is needed to get away from the dreaded hump. (Still not sure if anyone can hear the hump.)