Hi!
I do hope that Devuan can avoid that usrmerge madness forever. It 
appears to me that at least for Debian 12 based Devuan 5 aka Daedalus it 
still can.
usrmerge (35) unstable; urgency=medium
 .
   * Partially revert and further change the fix for #1024596, because it
     was incomplete and would fail when the directory containing the 
     RTLD (e.g. /lib64) did not exist in /usr. (Closes: #1025926)
Just what can possibly go wrong?
Even if done "right" according to
https://wiki.debian.org/Teams/Dpkg/MergedUsr
I am not interested in it.
Ciao,
-- 
Martin