Please enable ArcGIS Pro to save without creating a needless file geodatabase, or ANY empty data source that the user has not explicitly created or indicated should be created. I almost never use a file geodatabase and have little use for it. Most of my maps consist entirely of SDE data with some CAD data or shapefiles that may have been sent to me. Please don't force the user to create needless clutter.
Please note: This is related to but is NOT a duplicate of the idea to Open ArcGIS Pro without having to Save. That idea is to open Pro without having to save at all. This new idea is to allow saving without creating a file geodatabase.
It is possible to enable ArcGIS Pro to save without creating a file geodatabase by following the help: Change project settings—ArcGIS Pro | Documentation