Transclusion is an appealing and beautiful seeming idea but it's an extremely difficult thing to implement. Even more, it's not at all evident in the end if it'

Transclusion is an appealing and beautiful seeming idea but it's an extremely difficult thing to implement. Even more, it's not at all evident in the end if it's desirable. Transclusion involves effectively conditionally including text or other fragments within documents. It's easy for schemes of this sort to become fragile constructs. Moreover, the primary motivation for such an approach is copyright management - IE, fighting the "information wants to be free" tendency.