When WDS connects to Box, it tries to list all objects from root folder. For this full permission to be given to crawl root box folder.
This is not practical for enterprise Box customers. For example, we can not get root crawl permission for IBM box enterprise. Enterprises usually control Box crawl permissions at folder level. Like in IBM, we got permission to crawl a specific folder but not root folders.
Hence, there needs a way where folder Id can be mentioned while creating Box connection. With this folder Id, WDS should be able to crawl without root folder access.
Without this feature, connecting to Enterprise Box is simply not usable.