There is a minimum 15 character limit on posting a comment. There are shorthand features provided by the chat formatting utilities such as [ask] get expanded to How to Ask which is linked to url.
But following can't be posted as comment, as it lacks the length validation
It expands to
See How to Ask.
As, I can't post this comment, I do need to include some other character's/ word and most often ...... (dots) . I don't say that is a pain, but this can be taken care of while validating the comment.
So, I think there must be a minimum pre-parsing to check if the final expansion meet the length criteria or not. Similar applies while posting "See [answer]" as comment.