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Will Google ever create a true web email client with completely independent inboxes for separate email accounts (under one login)?
Right now you can forward email to one address, associate multiple accounts with one account for choosing the send address or create labels for "artificial" inboxes. However, you can't get the type of multiple & separate inboxes that you would find in Mail or Outlook.
Why do I need to sign in?
Quora is a knowledge-sharing community that depends on everyone being able to pitch in when they know something.
Multiple sign in is already here and delivers this functionality. I can be logged in under my work email account, and have a shared 'helpdesk' mailbox available simply by toggling a name in the top right. Or, I can use a browser with two tabs open, each a different Google mailbox.