If that’s her point, she can make it. If it’s your point, I don’t find it useful. Joanna can do it, I can do it, DxO could do it. So what? It’s not about difficulty, it’s about priority. If DxO decides to prioritize this feature, they won’t have any trouble implementing it.
That’s exactly the point. DxO seems to be not specially keen on features that go beyond developing (a limited set of) RAW images. Both you and Joanna have proven that keyword management can be done … but DxO has other priorities to handle with a small team.