As a long time Ruby developer I frequently hear older developers talking fondly about their experiences working with Smalltalk long ago. When I saw this post, I was curious enough to watch a video just now by a respected Ruby dev (who's admittedly new to Smalltalk and using an older version of Pharo): <a href="https://www.youtube.com/watch?v=HOuZyOKa91o" rel="nofollow">https://www.youtube.com/watch?v=HOuZyOKa91o</a>. The video is short, but it looks to me like the advantage of developing in this environment is mainly that you can write a test, run it in a kind of debug mode, and when the environment encounters something it doesn't understand it gives you some options for creating something new like an object or a method to solve the problem. This seems kind of cool, but I feel like there must be more to it. Can anyone better explain the selling point, or share a video that highlights how this environment is so cool?