This allows you to read out the original
errors in your frontend.
The reason for adding this is because until now
you only had human-readable error strings.
Now you have a list of the actual errors that were generated.

So that communication and sharing is easier

These might come in handy when creating
custom queries/mutations

I'm sure this will be useful to some

This is not supported (yet)
Querying sub relation fields would only result
in zero/nil values coming back.

These might be temporary