100 Would Jesus’ other deeds fill countless books

The Gospel of John declares:
That there were many other things which Jesus did, and if they were written down carefully, they would fill up the world with books 

John 21:25 And there are also many other things which Jesus did, which if they were written in detail, I suppose that even the world itself would not contain the books that would be written.

I’ll assume that John speaks of the more important things which Jesus did during a three-year career, and not of the less important things like having lunch. 

So let’s say every one of these many other things took a couple-three pages if written down. And each book 300 was pages. Okay, then, the collection comes to fifteen- or sixteen thousand books.

Let's even allow for a total of seventeen thousand books. That’s a great many books. But still the world would contain them easily.  

For the sake of argument let's pretend that the world could literally get filled up with books about the many other things which Jesus did. I find it strange, then, that the four Gospels mostly repeat the same stories. I would expect the New Testament to have more books than the Old Testament (about thirty-nine for the Old Testament). The New Testament has twenty-seven books. But John says the whole world would brim with books about “the many other things which Jesus did.” Thus it's peculiar that the New Testament is so relatively brief.

Recap: If Jesus said and did so many other important things, it's odd that the New Testament is so short.