Just like HTC and Motorola, Sony has openly embraced the Android development community by providing official bootloader unlocking tool for its devices. This makes it easier for Xperia device owners to gain root access on their handsets, as they can simply unlock the bootloader and then proceed to flash a root permission manager app.
However, unlocking the bootloader of a Sony device disables certain features, which is why most users actively avoid unlocking the boot loader of their handset.