Without app-stores\digital assets, it's much easier to drop your handset and sync your minimal data to a new one.

Now there's a much bigger lock-in\tie-in to the platform that you've 'invested' in.

Edit: Er... I meant to say, that was part of the reason that RAZRs (and the multitude of candystick phones) were easy to leave behind and migrate to a new platform without strings attached.