Let me clarify this since I just did this research.
Different categories have different requirement as regard to EAD, like Employment-based, family-based, and asylum-based. I believe most of us on this thread is EB-based.
1. If you e-file, all the categories need to have fingerprint.
2. If you are from family-based and asylum-based, you are required to have FP no matter what way you file (paper-based or e-file).
3. If you are from Employment-based, (a.) if you have e-file, you need PF, (b.) if you are paper-based, you DO NOT need FP.