I worked for a company that uses Microsoft Navision. The consultant/dev wold remote work via Teamviewer directly on the production system. Build in editor had no syntax highlighting. No version control possible, since the code is in the database. (Unless the dev copied the code into Notepad and saved it separately.) Certain reports would block all clients company-wide. To print something one would need to click ~6 buttons with super long mouse movements. I programmed AutoHotkey-Scripts to ease the pain. "Fun" times :-)

Syteline would take HOURS to run a report that generated estimates on how much material needed to be ordered for the next month. Year end reconciliation would take over 12 hours. It was just absurdly slow.

"generated estimates on how much material needed to be ordered for the next month" depending on how they doing it could be aching to training AI. IMHO this process taking hours is normal

Nah, it is just basic math based on the quantity and type of product that is ordered.