We have lots of toggles and build steps in ToT for image types that we don't build anymore.
This is a tracking bug for cleanups related to this area: Removing options (eg. non-unified depthcharge builds) and build steps (eg. slicing and reassembling a perfectly fine image into an image that looks just the same).
The goal is to make the build process easier to follow, so we don't get support inquiries from inside and outside the team because somebody somwhere ran into an obscure feature and broke their build.