We are using the STUSB4500 and we plan to use VBUS_EN_SNK in its default mode. This means that the whenever a source is attached, that power is passed on downstream. That begs the question: what's the point of using VBUS_EN_SNK and the FET it controls? Why not just connect incoming power to the downstream circuits permanently?
That FET is to ensure the cold socket, preventing incoming negative voltage on VBUS.
Depending on your application needs, it is OK to remove the FET (to save cost or PCB space) but it will not be protected for negative voltage nor reverse battery.
