Bruce,
While it might be true that more individuals are moving away from file-based formats, they are still used extensively. For instance, there are occasions when I will have a GeoJSON file and all I need to do is open and inspect it (there are a variety of reasons for this--one of which is to ensure the GeoJSON file I created is working correctly. For instance, I will get requests for GeoJSON files from time to time). In such an instance, converting the file to an Esri-compatible format is self-defeating. Fortunately, I can just use ArcMap or even QGIS for this, though my desire would be really to stay within one environment at a time (and, sadly, the Pro conversion tool, which projects to WGS 84 and supports aliases, is superior to ArcGIS Desktop's Feature to JSON tool).
Todd