So, i have an Ipad2 and a laptop today.
Tomorrow my laptop breaks down, burns or falls in the river = total loss.
When I buy a new laptop, this means i cant sync without losing data ?
No, you can move your iPad to a new computer. It's not a procedure you want to do everyday. It is slow, lots of data has to be copied. It requires preparation to make sure data is not lost. And like any other transfer of large amounts of data and syncing, there is always a chance that something will go wrong and you'll have to rely on the backups that you probably didn't do.
Keeping two devices in sync, especially when one is the main/master device is fairly straightforward. Keeping several devices in sync when any device can be changed at any time is a royal pain. In peer to peer syncing you have to track every change so that every device knows when that change was made and what change is current.
When studying Windows Servers I saw a bit of what went into keeping a domain server's data synced, and how it could go wrong. It takes a lot of overhead.
Everyone complains about how terrible iTunes syncing is now. Have you considered how much worse it would be if Apple decided to increase the complexity of the problem by an order of magnitude? iOS iTunes are simply are not a mature enough technology to tackle that, and it really isn't the kind of complexity you want in a mobile device anyway.
Oh sure, something simple could be done, if you are only talking about one or two databases. But the whole iPad, apps, media (with the headache of DRM and keeping copyright holders happy), etc.
Apple isn't moving to the cloud just for fun. By moving to the cloud they create one central place to sync to that is available to all devices. It eliminates the complexity of peer to peer syncing while giving people the everywhere syncing that they've been wanting.
So this, like so many other gripes is something slowly being addressed. I don't think iOS 5 is going to solve all the syncing issues, but it is certainly a step in a good direction.
Ok, I'll shut up now.