Because the DAZ Importer addon has grown too big and unwieldy it has been split into several submodules, or features. The core functionality is always available, but peripheral tools are relegated to submodules that have to be enabled in the add-on preferences. The core functionality is roughly what is needed to make the Easy Import tool work. This was discussed in the previous post on Modularization, and the modularization process is now essentially complete.
Documentation on the various features is available at https://bitbucket.org/Diffeomorphic/import_daz/wiki/Features.
To see in where the buttons have gone, see the List of tools ordered by feature.