Cita: Según la página web de Mockup:
http://www.mockup.org/faqs/whats/
Mockup is not another GNU/Linux distribution. Distributions put a lot of programs together with some integration. There's no real integration and consistency because applications written for different toolkits and environments are mixed. We want to provide the applications the user needs and choose what the base system should have. No more OSS and ALSA, for example, because we choosen ALSA as our sound subsystem.
eso es bastante discutible, ademas lo que estan haciendo es quitar uno de los atractivos de linux que es su flexibilidad y libertad de "armar" tu sistema con los componentes que quieras.