I'm new on this forum, but moderate very large forums, one being for a popular electrical mfg often discussed around here.
My opinion, for what it's worth, is that editing should really never be disabled. In some forums there's "edit history" where you can see what has changed. In reality, if you think content should be preserved, the easiest way is to use quoting.
Especially on forums focused on highly technical community support removing the ability to edit can be really rough. Examples include technical write-ups, discovery topics, that have constantly changing data. Updating the OP with relevant links and revised information is preferred over digging through many pages. An example from me, a couple days ago, I thought I pulled a combo breaker so I said as such, then when I got home and checked it was just a GFCI. I struck out the word combo and changed it. If I wouldn't have, it might have created a larger discussion over something that wasn't correct.
If the mods or Will want examples from the forums I moderate DM me and I'd be more than happy to provide examples.