I cannot provide a picture of the section I'm referencing as this feedback portal doesn't allow attachments. If you'd like a image of what I'm referring to, please respond and I'll pass it along.

There is a small section on the upper left of the Yahoo Mail interface that lists all the email account I monitor and, if a new email comes in, highlights the number of new emails in each mailbox. This list is very convenient to determining across all my email accounts, without doing a 'switch' between each, what requires my attention and what doesn't. Please do not remove this functionality from newer versions of Yahoo Mail.