It has EVERYTHING to do with distros.

The process is wholly dependent on bootloaders, systemd versions, and a bunch of other version-specific tooling.

Which none of the distros can ever agree on, so there are 50 variations of implementing disk encryption.

It's all luks2 and kernel negotiation. You use fdisk or similiar to partition and then the kernel mounts it based on the bootloader config.

Literally the only thing distros can do is give you options during install for the partitioning but that is a personal decision for people and it's basically remaking gparted.

please have an llm explain it to you.