Note that the same people who are behind the /usr merge have actually been working on making Linux work with a read-only / out-of-the-box, for use in embedded and stateless systems (We are mostly there, but not entirely). We have the embedded use of Linux and systemd firmly on our map, but initrd-less systems with /usr split off are definitely of little usefulness in our eyes, since they are useless for embedded and pointless on bigger setups.
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