Ah, well, if you're culturing microbes keeping the soil evenly moist is important. Also, if you go back and read some of Blaze's posts, he's found that if you keep it moist the roots *will* grow. Big roots are good, yes? They are in my world, at least. Therefore, if moist soil means happy microbes, and happy microbes mean happy roots, and happy roots mean big roots, then my plants perform that much better. And all without me having to be overly concerned with balancing nutrition, only water.
I thought I already adequately explained why it's simply easier to keep potted plants at a more even moisture level. Plus, for me, it's just easier to get water into the saucer and use that to monitor and maintain moisture levels than working it the other way around. This is specific to my potted plants, I don't water the stuff in beds and in the ground from the bottom up, those are on timed irrigation.