Well you are wrong. All of that was a retcon after the fact. Ask the folks from Bell Labs because that's where the story comes from: /usr meant Users. Duh. Th

Well you are wrong. All of that was a retcon after the fact. Ask the folks from Bell Labs because that's where the story comes from: /usr meant Users. Duh. They had one disk because disks were expensive. The disk got full, they got a second one, so they moved /usr to the second disk. Then the root disk got even more full and they moved some binaries to /usr/bin purely for disk space reasons. Then /usr got full but by this time it was too baked in to change so they invented /home and moved user home directories there on yet a third disk. Union mounts and other such solutions hadn't been invented yet. It was entirely an ad hoc solution to an immediate problem. This is simply a historical fact. I don't know where the urge to retcon a bunch of justifications for it comes from.