If you want to trim away the useless, then start with HR. Just keep the bare bones skeleton crew, let the HR chatbot and AI do the rest of that work. If Citi AI can’t handle the mundane low hanging fruit HR work, then it has no place trying to be wedged into anything more complex or technical.
If it can’t be developed enough, tested enough and rock solid enough to handle the HR work load, then you have business trying to make it do anything more complex. It’s like trying to use a calculator that can’t add or subtract to perform advanced algebra. Use the HR role as your live test bed. Once you get that part down, you can then showcase what a success it is in all you little ppt slides and THEN move on to something more complex.