You're assuming that BSD systems would have evolved the same way over the last 35 years. I don't think that's a given. People like to tinker and would have crea

You're assuming that BSD systems would have evolved the same way over the last 35 years. I don't think that's a given. People like to tinker and would have created alternative ${anything}s for BSD systems. And even with a bundled userspace and kernel you still have distros; e.g. PC-BSD did the whole "fat packages" thing 20 years ago, and there have been tons of "distros" based on various BSD systems. Jails weren't created until around the late 90s (1998 or 1999 IIRC), and who knows what that would have looked like if (Free)BSD had massively taken off in the same way Linux did, and who knows if "FreeBSD cgroups" wouldn't be a thing in addition to jails? Or: all the people that worked on those Linux things wouldn't have worked in a completely different field: they would have worked on BSD, presumably with (roughly) the same interests, and (roughly) the same opinions. Of course it wouldn't be exactly the same, but roughly, from a high level? It would probably be very similar.