More image based development. Developing against the running program. Ability to debug unhanded errors in real time while you fix them. Like how you do with Lis

More image based development. Developing against the running program. Ability to debug unhanded errors in real time while you fix them. Like how you do with Lisp/SLIME. I think this is the best way to develop hands down. But its flown under the radar through the entire 90's era up to the present.