[strav]

From a practical standpoint, what can the D-Plane concept do for you that 1-L #5 through #17 cannot? Also, on what other basis -- practical or theoretical -- is it superior?

There are now two camps, one espousing Kelley’s work the other Jorgensen’s. This is like disputing the value of the chicken over the egg. One is an integral part of the other. One is the machine (1-L #5 through #17) the other the result (D-Plane). Without either both are poorer.
That which increases our understanding of this game should be embraced by all.