Google wants developers to focus on quality of apps on tablets. There are mainly two types of issues. Most of the Apps developers do a quick and dirty job by expecting to run the Apps devloped for mobile handset to be run on Tablets as well. Also developers seldom pay attention to the different screen sizes and resolutions by different Android tablets.
This checklist is essentially to trap all the issues due to screeen sizes as well as trying to use unsupported features on tablet devices (e.g. wireless network or telephony)