1 - Proper refactoring of dynamic languages due to the image nature. IntelliJ gets it most of the time.

2 - No continuous indexing of source code, stuff is just there.

3 - During execution of REPL statements or debug sessions, an errors jump into the debugger, fix the issue and continue as if nothing had happened

4 - a REPL that integrates the code being written, with inline images and graphical representation of data structures

5 - The complete developer experience is available to the developer and can be customised at any time without rebooting it.

6 - Code components can be integrated into other documents as live objects (this is where OLE and Taligent got their ideas from)