I think it would make sense to have a specialised forum for it. The question & answer format requires data that Lemmy just isn't able to fully replicate as it is.
Also the community editable nature of stack exchange is really unique and more like a wiki than a standard forum/branching discussion threads, where we're presumed to have sole ownership of all of our posts.
Presentation matters. Replies to posts about minor items aren't displayed as prominently. This means the important answers are large and in charge, while debates about the merits of Rust in this situation are pushed away.
Basically any member is allowed to edit anyone else's question or answer. The changes may go up before or after review by mods depending on the member's trust level. I've had my questions changed before. It can be kind of annoying but I understand they're doing it to maintain some level of quality.
Is that the only difference? That feature doesn’t seem great tbh. I’d love a wiki on lemmy though especially one that integrated to the point you can one click add a question + answer directly to the communities wiki
No, there are a number of differences. There's questions & answers under which there are comments, and a bunch of other functionality. It's so different to a standard threaded forum that you may as well build a new system from scratch. I honestly think it would be less work than trying to shoehorn lemmy into this role, and have another fediverse ecosystem built around it.