Retaining Walls need to be the same size as the terraforming blocks.

I think retaining walls would be more user friendly and easier to use if they were made to be the same size are the terraforming block sizes for mining and dumping. Right now I find it very confusing to try and plan digs using retaining walls since they don't match up with the mining zones as you go down multiple increments of 5 levels of mining. You end up sacrificing a full 4x4 area to the 2x2 walls just so that everything matches and you can plan how wide of a starting hole you need in reference to how big you want your hole at the bottom and how deep. You should just change the walls to be 4x4 innately and it would be a lot easier to implement and plan with them. Like if you wanted a 20x20 hole 20 layers deep you would need to start with a 24x24 area blocked off with retaining walls. Seems like builds like this would look better if the walls were the same size as the digging zone blocks.

What if it was a 4x4 block that had 2 steps to hold maybe 10 levels of material? Or would that be a little to easy?