I really like the ability of Pro to Export to AIX as it preserves the layer settings and is a lot easier to work with than exporting to PDF. That said, I often make use of the map series feature which only exports to PDF.
I would love the ability to export from a map series to AIX so I can further edit the files. I work for a Park System with over 400 parks so exporting each park would be pretty labor intensive. Thansk!