I have the "MUST USE AMPLIFICATION" qualification on my medical. It's just about the dumbest endorsement ever. Everything from the cabin speaker to the headphones has AMPLIFICATION. Just about the only time you don't have amplification is when you don't need to hear (I regularly flew with earplugs back in the pre-headset days).
In fact, had I not told my AME that I had hearing aids (but it was listed in the doctor visits section), he'd have probably issued me without the restriction because I have no problem with the standard tests (my loss is only serious on one side). I didn't fight it because it's less of an issue than my "must wear corrective lenses" one.