I dont see how limiting to 3k character avoid long post because... it is a limit when you post, not when you edit...

Now, why most of all other forum dont get this kind of limit?
Why it was not this limit even 15 years ago? ...

FFXIV forum is one of the less ergonomic i know... greatly due to this 1k/3k limits limit that give nothing because we can just edit to go over... (easier to cut half of your text, post, edit, paste, post... )