Because many of the familiar Webappbuilder widgets are not yet available on Experience builder, complete migrations from Webappbuilder to Experience builder are not possible for a lot of my web apps. Yet, Esri is beginning to change how map views work on the map viewer, so things stop displaying properly on the Webappbuilder apps unless I open the classic map viewer and manually fix the visualizations. I see this as Esri really beginning its move to phase out Webappbuilder.
This puts us in a bind. Not all of us have the time to hang out in the classic maps to manually fix visualizations to accommodate the planned obsolescence of Webappbuilder. But Experience builder is not mature enough to accommodate all the Webappbuilder functions. Having one-to-one equivalency of ALL Webappbuilder widgets BEFORE phasing out Webappbuilder would really have helped with making a smooth transition. But better late than never...