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What is Stack Exchange not good for?

The Stack Exchange Network contains a lot of sites and it works especially well -- particularly when used in combination with a search engine -- for answering one-off technical questions. But what is Stack Exchange not good for?

For instance, it doesn't seem to provide "paths" through existing questions and answers that people could use to learn a subject from scratch, although this might be a good idea! It doesn't seem to want to be an encyclopedia (or does it?).

Indeed, it seems to "do one thing and do it well", which is of course a great model for success on the internet! Are there plans to expand the interaction model, or are the limitations seen as good and healthy ones?