For 23.10, glibc changed version, if a user is running a binary that explicitly links against an older version, that binary will not work anymore. I would like to live in a world without these kind of binaries, but they exist, and users do rely on them.
That is not actually true. glibc hasn’t changed ABI versions in a backwards incompatible way in a long time. You can’t use new binaries on the old system usually but you can absolutely use old ones on the new system.
Many other libraries do change ABI versions more frequently though.