Brian
In the Los Angeles area, there is only one person that I have seen that is at that "world class level" and I have been looking for 18 years
Are you thinking of Tak Shimazu?
BTW, I don't think that it is a matter of lack of skill, the reason why you don't see those pads here in L.A. It is a different approach to bonsai, here in So. California. It's a more relaxed, enjoy-the-hobby type of approach.
Anybody who has a high skill level, can do those pads. It's not rocket science. But when you have such a complex series of so many pads, the tree becomes very high maintenance. An average person has little time to maintain that kind of tree, and one cannot afford a dedicated professional to keep the tree in shape. So, instead, we choose a much more simplified pad structure, whith significantly lower maintenace requirement.
I am estimating that the number of pads on that Suzuki tree are in the range of 80 - 100 pads. That's an insane amount of pads, and work to maintain it. There is no way that I would be willing to keep such a tree in my backyard, even if I was getting it for free. It's basically a full time job. Having up to 15 well placed pads on a tree is more than enough for me. That's because I like to have a variety of trees, and having a very small number of high-maintenance trees is not something that I would pursue. And most bonsaist are of similar view. A small collection is not something they want.
In Japan, it's a different story. You have hundreds of bonsai professionals, and each one has a nursery with 3 or 4 slaves working for him. Here, on the other hand, slave labor is illegal. One has to follow the minimum-wage laws and Obamacare. It's a different situation alltogether.