Not sure about bookworm since Debian seems to argue a lot!
Overall however it is clear that all modern Linux distros have taken Fedora lead (actually it was Sun Solaris UNIX who started it and lead the way) and moved towards usrmerge situation.
Somewhat annoyingly to me, Void Linux does implement usrmerge situation but with some minor differences to Fedora and others following Fedora lead:
In Void filesystem (and thus KLV), /usr/sbin is symbolic link to /bin, which itself is symbolic link to /usr/bin, whereas in Fedora (and recent Pups), /usr/sbin is a real directory that /sbin is a symbolic link to.
Similarly, /usr/lib64 is a symbolic link to /lib, which itself is a symbolic link to /usr/lib, whereas in Fedora /usr/lib64 is a real directory that /lib64 is a symbolic link to.
In other words, Void Linux takes usrmerge to the extreme where all binaries end up pointing to /usr/bin and all libs point to /usr/lib. One exception, that may or may not be true now was /lib32 that pointed to real directory /usr/lib32 (why that exception?!!!... must be something to do with way their legacy 32bit packages worked I suppose).
I find it annoying, because simple little differences like that are what tends to make packages from one distribution incompatible with another even in cases where all else about a package (in terms of compatibility) might be fine. Just shows why earlier Puppy filesystem hierarchy was such a design mess/nightmare though - dimkr correctly addressed that rubbish situation.
I do kind of like Void's more 'everything' to /usr/bin and /usr/lib approach since never have to wonder where things might be, but... Fedora (RedHat's development distro really) rules the waves when it comes to such matters and probably best to just go with the flow. Hence why I'm happy to have been able to include Fedora Rawhide (most leading-edge Fedora dev distro) in previous weedogit.sh (now firstribit.sh) since I can check what Fedora are moving towards. Yes, I know, people don't like being told what to do by the likes of Lennart Poettering..., but overall, in such matters I go with the flow and works for me thus far.