So will every post need to be 999 words long? Not a word less, not a word more. If not, the limit itself doesn't press an issue for creativity. Is the post too long, or too short, that depends mostly on the reader. Six word short story by Ernest Hemingway has 32 characters:

"For sale:
Baby shoes. Never worn."

Maybe you just want a 999 word system... it is your origin story - the "999 man" !!! :D

All joking aside, I see the benefit of helping people better understand their work, just can't shake the fact it is still missing something.