Hi! Thanks for the reponse - I am impressed by your ability to respond almost immediately! However, should the bug report be left open for a while and not immediately closed? Are you willing to review/merge if somebody else submits an improvement to the README at https://salsa.debian.org/md/usrmerge?
I can read some frustration from your reply with references that the information is already easily available somewhere ("This has already been discussed at lenght among the people attending the related Debian infrastructure.") and that Ubuntu's switch to usrmerge is common knowledge (apparently happened in Ubuntu 20.04 based on https://packages.ubuntu.com/search?suite=all&searchon=names&keywords=usrmerge) and confidence in that the fork that Ubuntu maintains has not relevant changes. If you leave this bug report / request open and tag it as 'help needed', maybe other people who can more easily relate to the user/sysadmin perspective can step up and contribute documentation improvements?