I don't know what to say except that this has not been the case for me. Claude is a different person for every single prompt and has absolutely no core sense of what our goals are, or even who the "our" is that's having goals.

While my coworkers are very stable personalities of a consistent work drive, sense of pragmatism, things that they find more and less interesting, career aspirations, etc. they're not all the exact same, and I depend on that as I fit tasks and ownership to people.

Prompt injection is often not the issue: it's prompt quality. If given a vague spec (prompt), the human is more likely to understand the problem domain, see what's missing, ask clarifying questions. AI is more likely to assume and take a probable path, which may not always be correct. It's (probably) not going to tell you no, what you're asking makes no sense.