In the ArcCatalog/ArcMap environment a new Database Connection only needs to be added once. It then exists in either of the GUIs and only needs to be clicked to connect and view/add data.
In Pro, Database Connections are saved per project. For every new project all of the database connections need to be added again. Every. Time. For a company that creates maps for each user request, this is a big time suck.
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