Really, the format of your email is dictated by the business norms of communication that you operate in. If your norms dictate that your emails must, say, be written in an extremely overwrought and formal manner that massages egos, then LLMs to generate and summarize might be the technology that brings efficiency while upholding these norms.

Speaking to the performative importance of cultural norms, many workplaces would not look kindly on certain white-collar roles if they wore a T-shirt to the office; even if it is more efficient, or comfortable to wear the T-shirt.