I've had an idea for a few years to create something similar: an Abstract Syntax Tree (AST) informed editor. The primary goal was to shift the editing experience away from changing files and focus on modifying pieces of code, regardless of their layout within files.

Although I hadn't fully developed this concept, it's exciting to see someone else exploring this idea. I'm not likely to switch to using this editor but it is an interesting playground for me to continue thinking about these kinds of ideas.