LJ features not in Dreamwidth
Some features LJ has aren't going to be available in Dreamwidth, at least at launch.
Maintaining and documenting S1 is a lot of work.
Technical reasons; hope to add eventually with better service integration.
Never came out of beta on LJ, not much interest.
Expense, would need to rewrite the technology. Someday.
Same as phone posts.
Better off dead. People who like them can install Snap.com's technology on their browser anyway.