In the File Entity module, what is the purpose of multiple "Enabled displays" and "Display precedence order" for a single display mode?

In the File Entity module, what is the purpose of multiple "Enabled
displays" and "Display precedence order" for a single display mode?

In the File Entity module, what is the purpose of multiple enabled
displays and Display precedence order for a single display mode? Or what
is the use case where I would need to provide multiple ones and define
precedence of one over another?
There is little to no documentation on File Entity (understandably as it
is still under heavy development), and I am trying to wrap my head around
it a bit more. I just can't think of a use-case where I would need more
than one "display" for a single "display mode", where the first would not
"validate" and therefore look at subsequent ones that are defined.