User of web apps regularly receive shapefiles with more than 1,000 features from other users or clients. At the moment there is a limitation of 1,000 features for adding shapefiles in Portal for ArcGIS. It often occurs that shapefiles contain more than 1,000 features, e.g. a small village easily has more than 1,000 inhabitants.
Please allow the ability to add shapefiles with more than 1,000 featurtes to a web app or web map in Portal for ArcGIS or provide the ability to change the limit in the portal's settings.