Hi @crystalatsafe thanks for setting this as an idea. Several of our clients are heavily using “grouped layers” both in ArcMap and ArcGIS Pro. For some workflows the lack of support for grouped layers in the Esri ArcGIS Layer Reader makes the process of authoring the FMW Workspace not impossible but requires much more efforts as :

• grouped layers may use several datasources. Workaround is then to add several Readers in FME
• sublayers of the “grouped layers” may use ArcGIS “definition queries and spatial filters” which has to be replaced by the filters i FME

I.e several workarounds are possible but may increase the efforts in FME significant compared to a solution where the Esri ArcGIS Layer Reader support the group layers where all the datasources and “filterings” issues are already taken care of.