Having to analyze a running program increases the work and complexity for index code by an _incredible_ amount. When you can simply design a language in such a way as to be analyzable in the first place, I don't see why you'd want to require so much more work out of your tools, and especially your tool writers.

Take my wish for Github to be more navigable. In a statically analyzable language they can run the analyzer and update their index on every commit. If they have to run tests then they have to basically add an entire continuous integration service which is a _lot_ more work, resources and security risk. Why make it harder than necessary?