'Up to 10 hours of surfing the web on Wi-Fi or watching video' -Apple
That's not a 'full day' battery life if you are doing more professional work like video editing and music creation.
Nobody is saying they want a device to last 'an entire week'. It would be amazing if you could do some actual mid to high-performance work for the entire duration of a plane flight or places without available outlets to use.
Nobody asked for the iPad Pros to be thinner. They're already comfortable to hold at the previous thickness. An extra 2-3 hours of battery life would've been more welcomed and a good selling point.
Like the previous person suggested: vote with your wallet.