The new model building experience is far better than the classic and needing to click into every module if syntax is unknown. A big incremental enhancement would be to add some sort of icon or naming to show you the Line Item type. Adding this naming would allow the builder to better understand what they are referencing and could lead to many less model toasts. In my example attached, it would be great to know if that line item is a boolean, number, etc. so that I can efficiently build.
