Great concept, but needs work

I liked the concept, and the interface of changing column proportion was easy. However, two deal breakers when used on the final WordPress block editor (on WP 5.0.3):

1. It breaks the CSS for the standard WP columns on the front end

2. It behaves like a block, not a block container. With standard WP columns, I can add sub-blocks underneath. This just gives me one single content area, that is difficult to format within.