The introspection via all the commands bound to C-h <key/s> is a major thing I miss from any other system. That includes the ability to view and debug the sourc

The introspection via all the commands bound to C-h <key/s> is a major thing I miss from any other system. That includes the ability to view and debug the source code - including the base level commands written in C if you've configured it to do so. Plus, it's all right there _in emacs_ with all its facilities and your customisations while you're using it.