The real issue isn't the tool itself - it's the transparency. Using AI to polish routine emails is basically fine, similar to how nobody discloses they used Grammarly or autocorrect. Where it gets dodgy is keeping it hidden from your coworkers and employer. If your company has a policy on AI use (and increasingly they do), you're skirting it. Even if they don't, the secrecy matters because it creates an information asymmetry - people think they're reading your unfiltered voice, but they're getting a sanitized AI version. That's the ethical problem, not the efficiency gain.
The distinction that matters: are you using AI to express what you already think more clearly, or are you outsourcing the actual thinking? Status updates and meeting summaries are usually just format work - the information and decisions are already made, so having AI structure it cleanly is fine. But if you're relying on ChatGPT to figure out what to say, to sound diplomatic when you'd normally be blunt, or to generate ideas you don't actually have, that's different. That's misrepresenting yourself to colleagues.
My practical take: either check your company's actual AI policy (many places have clarified this by now), or just be casually open about it when it comes up naturally. "I drafted that with ChatGPT's help" is way less of a problem than getting caught hiding it. And honestly, if the polish matters that much to people, they'll care more about the substance of what you're saying than the tool that helped format it. The secrecy is what creates the ethical weight.