Again, you're assuming "can't" instead for many of these people it's "Why would I waste my time syncing".

I have more apps than fit on many of my devices for instance. I have iPad and iPhone versions of the same apps in many cases.

Syncing only turns into pain as it's a pain to get exactly what you want on each device when you have a few hundred apps to go through.

All of my contacts and really anything important is in the cloud. All pictures are copied off from a program that doesn't suck, etc.

It's free and easy to just install the few apps I want on each device through the store.