For those who have already created Web App Builder applications, a 4x builder would allow us to use the new features of Web App Viewer Beta.
They did. It's called ArcGIS Experience Builder.
Just as John mentioned, the new generation of WAB with the new API is the Experience Builder, which also eliminates the map as a centric component - it's a whole different architecture with the newest JS technologies.. which is why it's easy to miss as the new generation of WAB
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