You’ve indirectly highlighted the biggest issue I have with referring to literacy as “x-grade reading levels”. Literacy skills stack on top of each other and, sometimes, in slightly different orders. Calling them by a grade level makes people associate these skills with certain educational levels in school when, in reality, you only learn these skills from repetition and growth. I wish there were (and maybe there are and I’m just not familiar with them) clearer distinctions for these types of skills that meant more than “x-grade” which is practically meaningless to most people and harmful for those struggling with reading and comprehension.