For the first time in years the player no longer depends on ultra rare gold units to survive or advance! Each character is useful with the right setup and you can even complete the game with 1* units!
The game soundtrack is amazing and gets even better on certain events, the farming aspect for materials these days has been reduced drastically since you can exchange lots of materials from event shops.
Best of all, If you need a core character you can borrow it from a friend to save you from a pinch! Quartz (premium currency) might be expensive but even F2P can easily assemble a great team provided they spent on banners wisely.