At this point I think we might just be talking past each other, but I fail to see how this resignation letter meets that definition either. I don't see the letter as harassment to the core team. It also doesn't strike me as a letter designed to injure or grieve.
Semantics aside, the letter may not give enough information to you, but it gives enough information that anyone privy to the internal team dynamics will understand the underlying issues and the logical progression of events that lead to the resignation.
Semantics aside, the letter may not give enough information to you, but it gives enough information that anyone privy to the internal team dynamics will understand the underlying issues and the logical progression of events that lead to the resignation.