I have many (lots, hundreds in fact) MXD's where folks have a XY Event Layer pointing to a XLS, CSV, TXT, DBF, whatever. These are not "operational" layers, just some working data they need in their map.
It's important to note, that I can open this map on any computer, or any user can open it, as long as they are mapped to the drive that has the folder that contains the xlsx file. I don't have to set up some sort of template or favorites things so folks could, as they expect it to work, open up the map and not have to repair XY Event Layer data sources.
So I kicked the tires on importing a few of these into Pro today.
Imagine my disappointment.
The disappointment grows...