X86_64: 64-bit kernel not enabled by default?

Hi, I just started using the buildroot system, after selecting x86_64 and running make kernel_menuconfig, I couldn't help but notice that the option 64-bit kernel is not enabled by default. Given the advantages of having a 64 bit kernel, why is this not enabled?

Enable the subtarget = x86_64 and target profile = generic x86/64

CONFIG_TARGET_x86=y
CONFIG_TARGET_x86_64=y
CONFIG_TARGET_x86_64_DEVICE_generic=y

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