Why would this widget even be pushed out without this capability? The geoprocessing widget capability is a huge need and is currently unusable.
My informed guess is the ExB team needed a "success story" to point to on this front. ExB is and continues to be in beta for an unacceptable length of time. It seems things are marked as 'done' for milestone celebration, but do not align with their actual implementation. Like 75% of their functionality matrix is just an outright lie.
I'm admittedly a cynic, but ExB offers UI advancements at the cost of functionality, stability, and usability, seemingly introducing more problems than it attempts to solve.