Re: BSD would have picked up all that slack.
"I notice you didn’t mention the point I made about supercomputers."
I chose to ignore it, rather than point out your ignorance.
"Because that is some “slack” that BSD could never have picked up."
BSD was a strong player in the supercomputer world back in the day. The Cray-1, arguably the first modern supercomputer, ran quite a bit of BSD code once Los Alamos was done with it. (Also arguably, most Linux machines also run a lot of BSD code, but that's a story for another day.)
The last BSD-based supercomputer dropped off the top 500 list less than 10 years ago. Not for lack of ability, but because SUSE and IBM/RedHat pay more money to the research institutions who build the boxen.