Well, it’s not that such platforms are always needed, though. For instance you may rely on confluence so that managers can write and share documents… well, why

Well, it’s not that such platforms are always needed, though. For instance you may rely on confluence so that managers can write and share documents… well, why not let them write and share documents via github/gitlab (assuming your company is already using these platforms)? Common answer is: managers don’t know how to use github/gitlab. But that’s a sad scenario. Perhaps the company should hire managers who know how to use (or are willing to learn!) github/gitlab? I bet such managers end up being better than the regular ones.