IMHO the biggest advantage that Debian/kFreeBSD would have had would be first-class ZFS support. You can use ZFS with Debian today, but the license problem means it only gets supported through DKMS, which is a pain; a FreeBSD-based Debian could ship binary packages for ZFS that just worked out of the box.
replyConsidering the amount of Linux distros based on Debian, it is truly a shame that Debian/kFreeBSD stagnated. We could have had Proxmox/kFreeBSD with support for ZFS Boot environments! The evolution of FreeNAS/TrueNAS demonstrates things have been going in the opposite direction.
replyMoreover, many laptops working on Linux perfectly, are not Ubuntu certified. Lenovo Legion series generally works well, but it is not in the Ubuntu list. Id we'd make a list of all 8/10 or more compatible laptops, it would be huge.
reply> More sensible, IMHO, might be to bolt the FreeBSD user space unto the Linux kernel.
replyA lot of BSD utilities that are not POSIX has really close interaction with the kernel. OpenBSD’s *ctl binaries are often the user-facing part of some OS subsystem. Linux subsystem often expose a very complex internal that you need to use some other project to tame down