The key to language fluency and effective communication is two-fold: articulation and eloquence.
All (grammar) rules, though set down to simplify things, make for an oversimplification, stereotyping and a detachment from emotion.
‘To every rules there is (an) exception,’ Maybe. But without the rule there is no exception.
And there is no rule, really, but THE exception.
So, rules are there to break for the process of ‘unlearning’ to occur.