I think modern distros have resolved the issue . For example this is void-linux:
$ ls -ld /bin /sbin /usr/bin /usr/sbin
lrwxrwxrwx 1 root root 7 May 3 00:20 /bin -> usr/bin
lrwxrwxrwx 1 root root 7 May 3 00:20 /sbin -> usr/bin
drwxr-xr-x 1 root root 39444 May 10 18:41 /usr/bin
lrwxrwxrwx 1 root root 3 May 3 00:20 /usr/sbin -> bin
Ubuntu, Debian and RHEL, on the contrary still splits up:
$ ls -ld /bin /sbin /usr/bin /usr/sbin
lrwxrwxrwx 1 root root 7 set 25 2021 /bin -> usr/bin
lrwxrwxrwx 1 root root 8 set 25 2021 /sbin -> usr/sbin
drwxr-xr-x 2 root root 69632 mag 11 14:00 /usr/bin
drwxr-xr-x 2 root root 20480 mag 11 13:33 /usr/sbin