Hi Joshua, this is one of those cases people might not thank us for introducing a weakly typed read-only layer.
I disagree, people might not exalt Esri for introducing this functionality, but I highly doubt people would be saying, "I can't believe they implemented a weakly-typed read-only layer for GeoJSON support."
My beef on this issue isn't with Data Interoperability but with the core product. If ArcGIS Online can create a layer directly from a saved GeoJSON, why can't ArcGIS Pro; if QGIS can do it, why not ArcGIS Pro; etc....