So the /bin /sbin became redundant.
Sometime around 2020 someone observed that no current Linux can boot without /usr anyway. So what did they do? Move everything from /usr to / and drop the whole /usr legacy? Noooo, that would be too simple. Move / to /usr. And because that is still too simple, also move /bin, /sbin and /usr/sbin to /usr/bin, and then keep symlinks at the old locations because who's gonna fix hardcoded paths in 99% of all Linux apps anyway??
Oh, how I wish I was born in the '60s, when the world was still sane.