Books open your mind, broaden your mind, and strengthen you as nothing else can. So don't slack off on your reading. ;)
Why would that matter? He may just be a reader and not a writer. It's not like you have to be better at writing to make a review. You read the story and give your thought about it.
It will be explained in a later chapter.
Well, his dream is to become the number one hero. So it wouldn't make sense for him to become one.
It explains a lot actually, hehe.
Do you have any recommendations?
No, more like Shinji's Shikai
We aren't far enough into the story for such a thing to happen. And I would rather not focus too much on romance in the beginning.