I agree with much of what you said. I have tried the digital versions of the Goddess Tarot and the Rider-Waite Tarot decks.
I find that they yield the same results as any real tarot decks. Even though we are dealing with computer computations and not actual cards, as long as they intent is there, it doesn't matter. We don't actually see the cards until we have shuffled them, spread them, and drawed them.
As for the concern of energies, I have come up with two methods in which they can be incorporated into digital tarot card readings.
For the first method, I simply focus my energy on the device that I am doing the reading from, so I can be assured that I get an accurate reading.
For the second method, I visualize an actual tarot card deck and as I shuffle the digital one, the one I imagined shuffles as well. This way, at least in thought, the cards have some energy. I believe that perception is more real than reality itself.
This just helps me feel "connected" to the digital deck.
You may have to modify these methods slightly in order for it to work.