I wonder if a custom UI that auto-layouts different files in a 2D grid and connects them to each other in a graph in an intuitive way would help a lot with review velocity.

As in, if you have a large screen, a particularly-trained/prompted AI can organize the code changes in a "flowchart" with floating windows you can easily follow

Maybe in this UI, each code piece also comes with a summary from an agent that has already auto-reviewed the whole PR and creates a basic summary (instructed to be neutral but surface issues if it finds any).