Why does the Audi A1 have such a small boot size compared to other cars in its class?

I'm looking to buy an Audi A1 but I've noticed that it has a significantly smaller boot size compared to other hatchbacks in the same price range. Is there a specific reason for this design choice?

The compact size of the Audi A1 allows for better handling and maneuverability, making it a joy to drive in urban areas and tight spaces.

A smaller boot size also means lighter weight, resulting in better fuel efficiency and overall performance for the Audi A1.