A little background. I teach 1st grade. The school where I teach, the teachers are either literacy (reading/writing/phonics/social studies) or stem (math & science) teachers. I am a literacy teacher. Our students are also flexibly grouped. As they grow and reach milestones, they are moved to the appropriate class. The same goes for students that are NOT making gains, we attempt to find the the class that best fits their needs. I teach two blocks of literacy daily, to two very different groups of children. Would it be easy to do the same thing with both groups of students? Or would it be easier to take the lesson plans my fellow first grade teacher is offering up? Absolutely! However, that wouldn't be fair to the students.
What justice are we doing by instructing our students whole group? The days of the big anthology is hopefully gone from most classrooms. So it's time to get right of the whole "Turn to page 15 and let's read round robin" with the entire class idea.
Every student is different. They learn different, they are different. They come to us from various backgrounds and families. Some may be homeless, or the unwanted. Some may be sheltered and oblivious to this world we live in. Some students may be taking care of their siblings, and they haven't lost their baby teeth yet.