Hello JH,
SAP has Archivelink interface to OT and as SAP BW contains analytical data reporting on it and reload cannot( not in case of Nearline Storage Solution) be possible as you know.
The Add-on’s provided by OT in specifically ADA (Archiving & Document Access) is more systematic way of display of data and some other value features.
As you are not much worried about the reporting & reloading they won’t affect you. If you are using OTAS as server for retirement that is good unless no display of data is needed.
Hope I made you understand it. Please ask if you have any questions.
Thanks,
Kolusu