What do you need more, than the Aircraft Maintenance Manuals (AMM, IPC, WDM) and the Component Maintenance Manuals (CMM)?
Assuming they are properly prepared in Simplified Technical English (www.asd-ste100.org/) and in accordance with AECMA S1000D Standard?
Same documentation principles applies for modified system called Instruction for Continued Airworthiness (ICA)

you can check here for more details about OSD

https://www.easa.europa.eu/domains/aircrew-and-medical/operational-suit…

Above link refers to information for pilots, but the question refers to maintenance.
I have seen aircraft maintenance manuals, which are giving all information required to maintain the aircraft over define live. They are called AMM, IPC, SRM; CMM etc.
OSD is for pilots’ information, due to fact, that the AFM and pilot’s guides are not for all aircraft on an adequate level.
My comments refer to CS23 aircraft type only.

Yes, this what i ask about
OSD initially issued for pilots then cabin crew and it planned to be issued for maintenance
It contains different data that is not covered in amm, ipc and other manuals like the TASE items which refer to the areas that needs special attention during training for this specific type (like fly by wire for Airbus A320)