Oscar, that's how the Japanese like to grow them. I've found that the Japanese style happens to work well for my conditions. The Neofinetias love it and I like how it looks too. From what I understand, it's supposed to look like a little tree on a little hilltop.
I had one in bark last year. Didn't do diddly squat until I potted it up like this and the roots started going nuts.
Looks great!!! I love growing them in the traditional Japanese style. I tried doing it but I couldn't keep the moss in the mount style. I tried using a soda bottle top as a mold but it wouldn't stay. I might need to find a better supply of moss!