I think GP was saying that it’s /usr/bin rather than /bin for mounting as readonly. Not that merging any particular sbin with bin serves the purpose of readonly

I think GP was saying that it’s /usr/bin rather than /bin for mounting as readonly. Not that merging any particular sbin with bin serves the purpose of readonly mounting. Disclaimer: I’m mostly just a Mac user/interested spectator. It’s possible I’m misunderstanding GP, and it’s not clear to me why the /usr distinction matters for readonly mounting either. But I couldn’t help jumping in to see if I could help clarify something, because there are just an astonishing number of ambiguities and confusions about those ambiguities throughout the comments on this post!