Having a chatbot that can natively "speak" latex seems like it might be useful to scientists that already use it exclusively for their work. Writing papers is incredibly time-consuming for a lot of reasons, and having a helper to make quick (non-substantive) edits could be great. Of course, that's not how people will use it...
I would note that Overleaf's main value is as a collaborative authoring tool and not a great latex experience, but science is ideally a collaborative effort.