Generally, reading is very important. It's a must have skill in today's world. If you don't know how to read, then you can't really do much. Reading is also very important on a social level. If you have bad spelling or grammar, people may not really take you seriously. You won't get a good job too. Some people may look down upon you. So it's very important to know how to read in today's world.
In terms of reading books, I say it's very important too. Reading books opens you up to the usage of vocabulary. It deepens your vocabulary too. You learn how you express yourself better when you see the words being used in sentences. I had started reading pretty late to be honest. A bit too late. But my parents never stressed on the importance of reading, so I never did. Now I wish I had read books earlier on.
A very good example of what I had said about reading helping you express yourself better is my writing. I'll tell you guys that I had read my first actual novel at grade 6. Really, really late. But after that, I fell in love with reading. Anyways, near that time, I was asked to write a story in school. I still have it now. And when I look at my stories which I write now, I can see a difference between sky and land. After getting into reading, my writing skills has vastly improved. I can write much better now. And I'm sure that reading has done this. Because I find that whenever I write my story while I read a book, I can write so much more better. My writing is much more detailed. And sometimes, I catch myself using phrases that the author uses in the book I am reading at that time. It adds more depth into my stories, and I always prefer to write while I read.