Time is the main reason. In jobs where you write dozens of client-facing emails every day, small time savings compound fast.
Most people working in Outlook all day are doing exactly this kind of work: responding to clients, coordinating projects, clarifying requests, following up, documenting decisions, and managing constant communication.
Instead of writing every email from scratch, I can give AI instructions like:
“Read the email chain. The client needs X, Y, and Z. Write a draft reply in my voice.”
That takes seconds instead of several minutes per email. Across an entire workday, that can save hours.