A lot of people dislike books like these. I have my problems with them--usually due to the stereotypical depictions of characters--but I think they're necessary. Having read From Romance to Realism: 50 Years of Growth and Change in Young Adult Literature, and other books dealing with the history of children's lit, I see them as part of a pattern. The issue books emerge before the "problem" can become mainstreamed in literature without question. They serve a purpose, they give immediate satisfaction, immediate I'm-not-alone, how-this-can-be-dealt-with, this-is-what-this-looks-like. After all, often in a teen's life, the issue is everything. But they are NOT enough.
I read Follow My Leader so many times that my copy may fall apart. I have low vision, the fear of blindness is real to me and I use some of the MC's techniques to deal with life without my contacts. But I'm also aware of how rare it is to have a secondary character who is blind. Just an MC's friend, or an MC with a whole other set of problems who happens to be blind. The issue hasn't been solved with the issue book.
LGBTQ characters are doing better. They exist in the back and foreground without the whole book focusing on this element. We're not there yet, by any means, but the issue books have opened the doors. The toys are out there and can be played with. It's the job of authors now to utilize these things and weave them into larger narratives.
After all, would you want your life to be depicted only in the issue books?