The DMD (nor UP Alt pulley for that matter) was never done as a performance mod. Both are reliability mods.
Also the fact you stated "the car runs off the battery & the alternator will NOT draw a load if the battery is fully charged" leads little credence to your technical ability.
The car's electrical system runs off the alternator and the alternator supplies current load as the car's electrical components demand it.
"The battery has 2 functions: It's main function is to start the engine & it's secondary function is as backup reserve for when demand levels exceed alternator output."
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2-3HP for bolting on some ring of rubber and steel on the end of the crank???? Come on! It was done for NVH, not durability or power.
Where's your proof that the 2-3HP did NOT happen? (even though it did per the dyno & yes that's within it's margin of error, but that was already mentioned!)
Where's your undisputable proof that a DMD will not increase engine reliability?
Just going off the proven physic's facts alone showing it reducing destructive second mode vibrations should be proof enough that it's helping in the longevity department. Especially on an engine with a known problem in this area!
Again nobody said to install a DMD to make massive power gains. It is just an added benefit that the significant decrease in torsional bending and crank whip can equate to less parasitic drag placed on the rotating assembly and therefore make more power in the process. 
