It may look the same, but I think you are missing a bigger picture.

Google is at the forefront of machine learning. They have been doing it for a long time, and lately, they have taken it to a different level with new features rolled out across their various services.

For example, and you'd probably know, in Google Plus, now you can search pictures by the subject which can purely analyzes the data (without meta-data) and give you all the pictures of your cat.

I guess this new Inbox works in the same vein - I don't think it's just a big table of senders and their classifications - this seems to be more intelligent than that.

But it's okay to blindly criticize Google - in fact, it happens automatically if you are using a Macbook Air.