When submitting a question, the SE site check for classical words indicating that the question is potentially of low quality and in such case prevents the submission of the question and returns a message to the user.
There are key issues of grammars that could be filtered this way too. The most classical examples are the use of "???" or "!!!". Should we prevent the use of such expression in the text?
Note, that we should always allow for the use of these expression in quotes format and in code format.