There are a lot of improvements that they just don't want to introduce. For example, improving the skill book store. My friend made a mistake about three years ago and bought fragments of the book, which are still being sold, did they return the coupons to him? Whatever the case, he heard in response "wait until this function is introduced."

Also, the possibility of buying gold skill books will never be introduced. What for? It's easier to milk players and whales, let them buy fragments and spend more money.