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