Thanks for the reply, Rad. I know your time is valuable and you do an amazing job keeping this board updated, so I appreciate it.
Indeed, now that you mention it I recall once hearing JWG say that he had fallen out of favor with using progressed charts, that natal and transits is all you really need. That said, I have found secondary progressions to be useful in my own work, the basis of which came from my reading about progressions in Pluto Vol. 1. I've been meaning to try my work without progressions, but...old habits!
Similarly, with respect to JWG's preference for direct symbolism over derived, did he always use "true" motion instead of "mean" motion? I know that's the case for the nodes, but I'm particularly interested in Black Moon Lilith. Many astrologers use "mean" Lilith, but I can't get behind using mean motion, partly because it's not a directly correlated symbol (i.e., it's derived), and also because no one would use mean motion for the primary planets. So why use it for nodes and other symbols? My assumption is that JWG always used "true" motion.