Watering plants from above is unnatural? Are you kidding me? Which way do you think the rain falls? It doesn't matter which way the water gets to the soil, as long as it gets to it, and in the right amount. The roots will absorb it either way.
Consider the cons of sub-irrigation for indoor plants. How many people are going to keep the reservoir constantly filled, which will only promote the development of disease?
Get your facts straight before you pass crap on to unknowing people.