This is in a way a followup on We have a very large & widening gap between questions and answers. How do we fix it?. As a response to that, I am trying to downvote/close some old post we probably can do better without (mainly to reduce clutter, so it becomes easier to find the good stuff). But a few are locked (by community user) for no reason I can understand. Why? Such posts cannot be downvoted or deleted.
Some examples: https://stats.stackexchange.com/questions/15691/nonextensive-statistics and https://stats.stackexchange.com/questions/49969/questions-about-seqtreedisplay-and-graphviz. (Note that both questions have been automatically deleted in the meantime. High-rep users can still see them. No, you are not missing much.)
Shall I just flag for unlocking?