I have used web app builder and some of Esri's data collection apps such as survey 123 and GeoForm. I came across an instance where I would have loved to have my GeoForm integrated into the web app. I hope that this can be incorporated in future. I was able to just add the GeoForm as a link in my web app, that redirects the user, but it would be cool to have it as part of the actual app and not a "redirect".
geoform
web app bulider