Please add the coordinate system information to the properties of the data in Catalog as well as the capability to Define. This is the quickest route for GIS users to access / query / define the coordinate information prior to adding data to a map - and the quickest way to identify undefined coordinate systems.
The ability to read the coordinate system quickly and easily is a basic fundamental task and going via metadata is clumsy.
Using toolbox is slow - extra clicks - when accessing this tool via the properties of the dataset should be a basic function.
Adding unknown data to a map is poor workflow.