They are built as part of building the distributed stage3 tarballs (so are the stage1 tarballs) but haven't been distributed in a long time. The reasoning behind this is principally, as computers have gotten faster, the saved compile time during install is no longer really significant, and the same exact effect can be had after the completion of the Handbook install by fully rebuilding the system set:
With that simple step added, there's no difference whatsoever in the finished product, and the support burden was thought to be reduced.
If you must have the stage1 or stage2, you can make them yourself with Catalyst (dev-util/catalyst) which is what Gentoo Release Engineering uses to prepare the stages.
- John
I can confirm that I have received between 0 and 499 National Security Letters.