It is surprising lemmy let's you edit titles on posts. It has saved me a ton of time deleting and reposting again like on other services.
I guess its only a matter of time till malicious people abuse this and it changes.
That's the reason, half of my Lemmy posts show the "edited" tag.
Just giving them the most cursorily glance on the comment overview page will reveal new writing or expression errors, which I then have to compulsively correct.