Can you expand on "some"? The article mentions grub2.

ijlx · on April 18, 2023

I'm not aware of any bootloaders that support encrypted /boot with LUKS2 aside from GRUB. GRUB itself didn't support LUKS2 until 2021, I believe; I imagine there are many people using versions older than that.

Arnavion · on April 19, 2023

Even with newer versions, some (many?) distro installers still default to using LUKS 1 for the root partition anyway. As the article also says, while grub2 does support LUKS 2 now it still only supports pbkdf2, so having root be LUKS 1 makes it harder to accidentally switch away from pbkdf2.