I don't see the benefits of absolute grading in middle school

It might be intended to let students take it easy until middle school, but this seems to be causing quite a few problems. Since most schools have a policy of ensuring a certain percentage of students receive an A for scores above 90 regardless of their actual level, the exam questions in lower-performing areas are becoming ridiculously easy. As a result, we are seeing a surge of students who received mostly As in middle school but effectively give up on their studies once they enter high school. I think it would have been much better to stick to relative grading and the era of taking nationwide mock exams to better prepare them for high school. Does this sound like an exaggeration? This is the reality.