I didn't read through the whole thread, however, we did run into the easy repetitive math homework timed math facts worksheets issue which our eldest DS had already mastered.

Upon entering the next grade they started the whole process again! We simply informed the teacher that our DS would not be returning those take home worksheets, there was simply no way we were going to support such unnecessary poor use of his time, it wasn't a discussion, it was a simple statement of fact.