Some ancestors will never have ordinance work done because of design flaws in the current system
I bring this up every once in a while in the hopes that I will one day convince someone it matters.
John Doe lived in Virginia in the late 1700s. Someone creates a record for him in FamilySearch: YYYY-YYY. No ordinance work has been completed for him.
A different person also named John Doe lived in England in the late 1700s. A record for him (ZZZZ-ZZZ) is in the system, and already has ordinance work completed.
A user mistakenly believes the two John Does are the same, and merges the two together, keeping the data representing John Doe from Virginia. FamilySearch now shows John Doe from Virginia (YYYY-YYY) as having all ordinance work done, even though it was actually done for John Doe of England. To users who take a look at YYYY-YYY in the future, there is no obvious reason to believe the ordinances listed as "completed" might actually have been done for someone else.
Time rolls on. No one realizes the error. John Doe from Virginia never receives ordinance work.
"this never happens" -- I don't have statistics, only my own experience. I have found it has happened many times in my own tree. Sometimes I've caught it by luck, sometimes by heavy research. I don't know how many times I have missed it.
"just unmerge the two people since they are not the same person" -- people don't look for improper merges before making additional edits--commonly there is no indicator that an improper merge happened months or years ago.
"you can look through the change log and see if an improper merge ever happened" -- deeply investigating the entire change log for this is an enormous undertaking, and requires unmerging all previously merged individuals and examining those individuals' change logs as well. It can take weeks in some cases. I have done this many times with varying levels of success. The process is very difficult even for experienced users, and can lead to inconclusive results even if done right.
"if you have reason to believe ordinances are wrong, contact us and we can investigate." -- there is no straightforward reason to believe the ordinances are wrong. Everything looks fine. But there is always a possibility that the ordinances are mis-assigned because of improper merges as exemplified above. Can I have the temple department investigate every single person on my tree? (I've been told "no.") I'm left with no viable solution.
"you can submit an idea to FamilySearch" -- I have done this many times over the past decade. It has been met with silence or dismissiveness. I have a hard time understanding why ensuring ancestors' recorded ordinances are legitimately theirs is not something that matters.