I think this request might be outside of scope but still putting it here. I read about Lazy Blocks on another page builder forum today. It seems interesting in the way it make the UI changes.
Default WP UI to add items inside inner blocks feel confusing for end users / clients. Lazy Blocks implements a more user friendly UI for inner blocks / repeaters.
Block user friendly editing mode for clients to easily add repeatable data / blocks and then able to switch between block preview.