Github user mosermw commented on the pull request:
https://github.com/apache/nifi/pull/246#issuecomment-190377532
When a PropertyDescriptor does not have a .displayName() set, then the
.name() is used in the UI. There was a time when .displayName() did not exist
and .name() displayed in the UI, so that's why you see many standard processors
that do not use displayName. displayName was added so that you could change
the name used in the UI without breaking backward compatibility in the flow.xml.
So the original comment from @alopresto represents the latest best practice
for NiFi processor development.
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