Keep in mind that modularity is a complex notion: the space of components can be rather non-trivial, in that the dependency graph can have a pretty interesting topology - if you include, in this notion, for instance, inheritance, generics (templates), and all the related usage patterns that have been invented over the past 40 years. (I believe Modula and Oberon both failed to address this complexity, having restricted the programmer's understanding of the concept to a very basic use case.)