Make it clearer that people shouldn't change names and vital info on established pages
I've been running into a lot of situations where, if an editor thinks a spouse is incorrect, they just change the name and vital info on that profile, even though that profile has sources, memories, relationships, etc. that are correct for that person. In other words, they take a profile that is mostly* correct and making it mostly wrong.
(* usually completely correct -- it's almost always the editor mistaking the spouse for a completely different person with the same name)
This causes a huge snowball effect, because other editors often don't notice that this happened. Instead, working in good faith, they start to "fix" the old profile to match the name, or worse, merge it into a "duplicate profile with the new name.
I'm not sure how to prevent this, but something that would help would be to add a line in the "Before you start" section of the How do I change vital information in Family Tree? article saying not to do this, along with any kind of tutorial where it would be appropraite.