I did a lot of homeschooling and tutoring long ago. I read many books about learning, teaching, etc.
I read about one study that used three groups of children:
1. One group studied grammar.
2. One group read good literature and studied grammar.
3. One group read good literature and did not study grammar.
Guess which group wrote the best English.
Group number 3.
Of course. Studying grammar in a tedious abstract way is obscene and absurd. Better to become very familiar with great writing.