I am a fairly new user to ArcGIS Pro. I am trying to give it a fair shot and I am actually beginning to get used to it, slowly but surely. In ArcMap I was able to calculate the X and Y in Decimal Degrees by opening up the attribute table and using the Calculate Geometry tool. ArcGIS Pro does not provide a tool that allows one to calculate the X and Y in Decimal Degrees with the "Add Geometry Attributes" tool.
I would like to suggest to ESRI that they add the ability to calculate the X and Y in Decimal Degrees. My thought is that they are planning to add this eventually, although I would like to bring this to everybody's attention so that it may be added ASAP.
Thanks for your consideration!