I think the post limit is fine. I have only hit the wall once in the three years I've used the forums. I do find the character limit really annoying. However, there is a fine line between not being able to say enough and saying too much. Honestly, if your post is such a wall of text that it could use a TL;DR you're probably not being very concise with your message. if I had to pick a solid number I would say 3,000 characters. If you feel the need to say more than that I don't think the edit button is going to bother you very much.