I don't agree with that at all.
What can you do on windows that you can't do on iPad....I ask that question and most people can't find an answer.
From my daily workload...
1. Open Oracle Enterprise Manager for monitoring Oracle databases - the interface is mostly Flash
2. Open one of my company's web products that is an application built in flash
3. Connect to an Oracle Database - the is no iPad Oracle client
4. Write SQL Code, debug procedures.
5. Run complex Excel macros with embedded visual basic code (or even simple macros for that matter)
6. Print
7. Go get a file from a network location
8. Edit a Powerpoint 2007 file (Doc to go screws up the formatting on mine)
9. Download 300 photos from your camera after a vacation - RAW format
10. Edit those photos in photoshop
I could go on and on. I love the iPad. Its great for what it is, but its not the same as a full OS laptop or desktop. That's the beauty of having both on the market. For those who want the full OS, they will take the lesser battery or whatever other downsides that may come with that. For those that only need what the iPad can do, the iPad is brilliant.
Why do fans of one device feel the need to destroy anything else that comes along? If it doesnt work for you, great. What you find important might not matter to others.