Devkit USB C flashing port specs

I know the usb c port can be used to connect a simple device like a keyboard or something, but is it capable of connecting to a usbc DisplayPort screen?

No, USB-C port does not support DP. For a adapter, it depends on the driver tuning, for Jetson side, it is just a USB-C port.

Ok, thanks, and what benefit does burning the fuses for usb3 flashing support have?

You can flash the device in usb3 instead of usb2.