The AI made my English email much more direct. Does that automatically make it more professional?

Not necessarily. First, clarify what this email aims to achieve. If the goal is to build trust, make the customer feel valued, or convey your position while avoiding direct conflict, a more diplomatic tone may be exactly what is needed. The article reminds us that ambiguity and indirectness can themselves be part of the message and should not be automatically treated as flaws to remove. Before asking the AI to revise, you can first explain your communication objective; after revision, have the sales team confirm whether the tone matches your relationship with the customer. Avoid assuming that simply because the text is more direct, it is therefore better to send.