the main issue is that's an ipad and it's locked. In contrast - a 15y+ laptop can be used (after few upgrades - i5-560M, 8GB RAM, 500GB SSD, AC-8260) to do office work: it runs the latest Firefox and Open Office + googledocs and friends without too much trouble.
Android devices are unlocked, non-manufacturer OSes are still well outside of "easy" to install, much less get all features working.
The main problem is that people maintaining the OS build for your hardware is the same people making the hardware. If legislation forced to divest both into separate companies the support would last far, far longer.