Minecraft wiki entry for Best_biomes_for_homes, associated text: Plenty of ender pearls. Ender pearls could be easily farmed.
The island is a large, flat, open space, meaning there is plenty of room for building. Although, the obsidian pillars would be a nightmare to remove if desired, as their size and the mining time of obsidian would make the project very tedious.
The sole portal back to the Overworld is located here, as well as all the portals to the outer islands created by killing ender dragons.
This is also the place where the player will consistently spawn within the End from the Overworld, so making the area safe is recommended.