Given that those are more important core books that most players would find important I can understand why only those ones have been reprinted, but I also agree with your point that Sixth World Almanac is probably one of the more important setting material and I'd like to see it with cleaned up data. And maybe a little more about 2050-2070 events, there are a number of things that are either absent or a little too glossed over. Alas.
