Keeping /usr/bin is a smaller change, because that’s where most binaries were before the merge. Only a few essential repair tools traditionally lived in /bin be

Keeping /usr/bin is a smaller change, because that’s where most binaries were before the merge. Only a few essential repair tools traditionally lived in /bin because that made each host store its own copy (rather than maybe depend on NFS). There will always be sets of tools managed by the distro or my org or my team or me, and it’s pretty important to segregate them to avoid and resolve conflicts, so I expect at least four entries in $PATH for the foreseeable future. Plus whatever messes vendors care to dump somewhere in /opt.