how can I refresh 4.x LayerList without destroying and recreating the widget?
In 3.x there is the resfresh method, but i can't find it for 4.x.
There is no refresh method to call in the 4.x API since they are supposedly watching for all events that should need a refresh and handling those internally in the API. If you are running into a case where the widget is not refreshing then you will need to contact esri tech support and report your use case.
Retrieving data ...