Although I'm curious about how they might address the "clickbait" issue of people having a massively upvoted/boosted post, and then changing the post to say something else entirely.

That seems like it might be a problem if people are allowed to edit titles.

Is it really a problem tho? If it would happen then the only thing that sucks is that you just got pranked. There are no karma points here to sell. I have more faith in ppl here to not do such things too. But even if they did there wouldn't be a big deal. I think it is much more worth it having it then not having it. Like ruud (admin at lemmy.worls) change his titles from "updating the server" to "[all done] updating the server". Also I am a believer in creating rules if it becomes a problem, to give everyone a chance to be believed in.

Sure, but I could see it being used to promote scams and things, too. You get a popular post, and then change it to something else, pointing to a scam, and feign popular support for it.

I remember that being one of the reasons for why both Reddit and Twitter didn't really have post/title editing.

It's better to also have some known method of counteracting any potential issues ahead of time, so we're not blindsided by something like that when it does happen, especially when it's something that could happen now, rather than some far-fetched issue.

*Title edited small text could be added maybe
Editing titles much later can be useful for example when discussing news or findings that later get disproved, at which point one could edit the title to reflect that so that future readers don't risk going down the path of trusting it.
Tag with "Title edited" also include a button showing former title as an uncoverable element.