Ok, so my first publish of this Question had 68 characters and I was able to publish it without any warning.
What prompted me this idea is that today I met an Answer from a 1k user that was Twitter-length.
Damn, he should know better, why do I have to call his attention to that if the system can do it?
Got angry (only in my head, not in my comment to the A) because of the relation Rep/Quality, but of course some kind of warning would be welcomed independently of Rep.
Hey, this is not Twitter and your Q/A will show up in the Low Quality review, are you sure? Yes/No