SUGGESTIONS FROM NEWBIE PERSPECTIVE
Clearly this was never intended to be an incomprehensible lost-in-space limbo-land for profiles.
I've been reading up on this via G2G where most of the comments are from experienced wikitreers, but I saw Linda Peterson wisely point out that "newbies" tend to misunderstand what "unmerged match" means, interpreting it as a merge which I approve, but the other manager has not yet got a chance to weigh in on. From that misinterpretation, the wikitree requirement for collaboration can fling those profiles into the unmerged-match blackhole.....a place where time ceases to exist, or at least the 30 day clock fails to tick.
A quick release button and comment box for why the "unmerged match" was applied are good ideas I saw to partially address this problem, but remembering my "newbie" perspective, I wanted to add ideas about language, time, and graphic interface as proposed suggestions for whoever is working on this thorny issue:
1.) Remove the word "remove" from the process of undoing an "unmerged match."
Why? No amount of help advice on merges explains this terrifying word "remove" . What was I removing??? This really was never clear until I finally got reckless and consented. Then, what had I done? Now I was having to restart the merge all over to complete it! That was very suspicious, like one of those M.C. Escher Mobius strips. where I might be walking this loop of ignorance forever. Neither intuition, nor help pages were of any use.
2) Build a highly intuitive graphic-user-interface format for getting into and out of the "unmatched merge" limbo. Test on "newbies" not pros. Refine until they are no longer screaming or quitting or misinterpreting.
3) Apply a time clock to "Unmerged Matches" with a warning to the person about to apply it that after 40 (?) days, anyone with the knowledge to resolve the match is free to do so. There is nowhere else on wikitree that I see individual contributors given such unilateral power to unintentionally clog up the resolution of what is designed to be a fluid group process. The time clock would empower the person with the best sources, the best insight, or the best tidying up skill to resolve the duplicate or to untangle it if it was actually two persons conflated.
4.) Rename the dreaded "Unmerged Match" since the name is open to misinterpretation. I think Jillaine Smith suggested "Delayed Merge" on one thread. That's more descriptive. Something like " 40 Day Merge Delay" could sync well if the time clock was applied, sending the idea that if you ignore this for over 40 days, someone else is free to clean up. "Merge Delay for Research" could work or "Request Time For Research." Help pages could make clear the regular merge gets a 30 day window for completion and this other thing gets granted a special 40 days. Make it feel like when a teacher grants you extra time to do your homework. A privilege to help you do your very best, but then to empower the group process to take over when it just ain't getting done.
It can be better, but it's a kink in the system for a variety of layered reasons, not just a one cause glitch.