The obvious advantage to native look and feel is that it will be familiar to users, and that consistency in itself might make for an overall more beautiful look

The obvious advantage to native look and feel is that it will be familiar to users, and that consistency in itself might make for an overall more beautiful look. If I use 5 applications and they all look entirely different, it will not look beautiful, and each time I swap to a different application I have to re-familiarize with whatever the UI designer thought was a good idea for that application.