I think I did overstate the case for Latin in this context. It is a good way to help with English grammar, mainly because (in my view) it forces you to think about and apply important grammatical principles in ways that a rules-based approach to teaching English grammar often does not. But, point well taken, it likely is not the best way to make use of one's limited time for this purpose.

I like your other points about grammar as well - very thoughtful.