"As low as they come"? You might be forgetting that Gmail has about a billion monthly active users. Scale matters. I'm sure you can think of many products th

"As low as they come"? You might be forgetting that Gmail has about a billion monthly active users. Scale matters. I'm sure you can think of many products that have fewer users, and features in those products that are less central to them than e-mail composition is to a mail client.