Implemented
Score1550
Add clustering and heatmap functionality to the ArcGIS Online webmap viewers and application templates. Both are available in the new Esri Maps for Office addin. A similar implementation for Online would be great. This would help novice GIS users toleverage the ArcGIS online webmaps and provided better visualization tools for point data added via shapefiles, CSV, TXT, and others.
Heatmap needs to be improved to ignore 1000 records limit set for feature service.
Point clustering is beautifully implemented in the newest Crowdsourcing story map template. Why it is so difficult to add this functionality to the whole ArcGIS Online?
How about implementing clustering in ArcGIS Online, on a new template, or as a WAB widget, that works as well as the one available for Leaflet, as demonstrated here?
Clustering was added in ArcGIS online as part of the September 2017 update:
Configure clustering—ArcGIS Online Help | ArcGIS