When starting to build in New UX, I did what I normally do when designing anything...software designs, drawings or even musical ideas...rough out where I'm going in a sketch using basic placeholders then start filling in the pieces.
In New UX I knew I wanted a handful of graphs here and there, text headlines etc. only to realize unless I have those ideas fully fleshed and backed by data, I am not allowed to save (publish) the board therefore I lost the entire board, all of the work done on it and a lot of time.
This really throws a wet blanket on the thought of sketching out / developing new ideas in New UX.
Please allow dashboards to be saved as drafts without requiring all cards to be filled in