If you have a full set of SOPs from the manufacturer, only when you want to
- abuse the hardware
- increase the costs
- reduce the performance
- create confusions
- uncover traps.
While the above reads unnecessarily sarcastic, take whatever company specific procedure you see, and audit it against the points above. There are quite a few in my OM-B. Regardless of the fact that for sure the author was a clever and well intending Pilot.