I agree with you. So I won't repeat back to you what you have written.
I spent more years than I care to remember in similar sounding work. Retired now,
To talk generally for a moment.
No one person, is aware of every nuance surrounding a complaint. It's important that the Investigator believes and understands the complainant, as you say. So there is the ideal world, and there is doing the best for the complainant, in the circumstances.
One day to train an investigator, is woefully insufficient in my view. How do you teach someone procedures, interviewing techniques, listening skills, report writing and so on in that time, as well as relevant legislation, awareness raising and so on? It can't be done.
I'd be arguing, at the minimum, for a much more comprehensive programme to train Investigators.
I presume that: they then would place a report of some kind before a panel / other managers.? They ( the panel) need dedicated education sessions too, similar content to that above. No point having diligent investigators, if the decision makers are on another page/ determined to defend the status quo.
The other thing to consider is your investigators should be volunteers, not, ( for instance) the press ganged manager who happens to be BME, or female, being told that they are now in charge of dealing with harassment investigations.
I didn't see the other thread. But women here too .
Thing is, if you have 30 years experience, and you have reached the conclusions you have....do you keep that same system running, as the future will continue to resemble the past? Otherwise thirty years experience could become one years experience repeated thirty times over. With the same end result for the aggrieved.
I've sometimes had two investigators working with a complainant, if needed, in some circumstances. Perhaps one may be less experienced in cases/procedures, but more able to relate to issues raised by the complainant and to give them confidence that they are heard, and believed.
Not sure that takes you any further, but my thoughts for what they are worth.
(We may have met somewhere along the decades
)