I'm actually a bit surprised about `/bin` there. Maybe it's archaic but I've always considered the point of `/bin` to be a minimal set of tools that could allow an otherwise-hosed system to be booted/debugged. So it (and `/lib` and a few other directories) might be on a small, read-only partition while `/usr` and friends are on a much larger read-write partition.
Of course in the last twenty-five years I don't think I've ever really used a system set up like that. But it does seem nice to at least be able to do so.
I've used to setup my system exactly like that, but that was in 20xx. Since then I've got lazy.
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