Young adult literature is for teenagers, and it honors their experience going through the torture that is adolescence.
This article talks about the troublesome approach to labeling everything YA, when there is a clear difference between YA books and Middle grade fiction. There are different themes, lessons, and problem-solving scenarios that are relevant to different ages. it can’t all be lumped together and still be appropriate.
Source: There Is A Difference Between Middle Grade and Young Adult Lit, and It Does Matter By Sarah Hannah Gómez