The compare instant app is a great creation for quickly serving out an application for comparing two or more maps.
I currently have one map with a handful of Network Analysis Outputs, and I would like to visualize these layers side-by-side. The workaround is simple, I just create another map and add it. I would have to re-symbolize all the data again because it was previously done in an existing map. Then I would also be hosting another map in our organization.
With a Layer Widget, I can add the same map in the Compare Instant App multiple times and in each map, I can toggle on an off the layers of interest. This would minimize the need of extra maps and would maximize the use of compare and contrast because now I can toggle multiple layers and further analysis on data.