I have to say I find Lennart's arguments quite unconvincing. As another person said, the vast majority of people just want default boot to the most recent kerne

I have to say I find Lennart's arguments quite unconvincing. As another person said, the vast majority of people just want default boot to the most recent kernel (which this proposal could do well). But then when it comes to the other points, yes I want to be able to reliably boot into other systems, but both systemd-boot and grub are notoriously bad at detecting other systems on disks (both use install-time detection IIRC). The only one which does a reasonable job is rEFInd. But even more a kernel with appropriate drivers could even add kernels/systems on usb disks to the selections (why do I have to go to the UEFI selection to boot from USB). The next thing he completely ignores is booting into zfs or btrfs snapshots, which is not possible using systemd-boot AFAIK, and again would be much nicer to do with a kernel.