> x64 has evolved quite dramatically since its inception

Can you expound on this? Besides AES acceleration and virtualization support, I don't know of any features on modern x64 CPUs that would be a limiting factor in an OS that doesn't 'require' TPM support.

One thing that comes to mind is 32bit efi w/64bit kernel for older netbooks and laptops.

But that has been an solved issue for years now. Both GRUB and systemd-boot support loading a 64 bit kernel with a 32 bit UEFI

I thought some newer distros dropped 32 bit uefi support - i certainly seem to recall an old thinkpad that wouldn't boot latest Ubuntu lts - but maybe I was wrong and it was old enough to be 32bit (don't think so...).

The article says it's running fine on a Core 2 Duo.