Kinda funny to see people extolling Sol by claiming the game is both very easy and hard

Players of different team strength could have totally different view of the game. For instance, at 5k HP, Sol's healing seems very helpful, but not so much at 10k HP. Besides, under good def down and gauge manipulation, the boss may not get a chance to use raging burst, rendering dispel or atk down unnecessary.

In general, defense and healer style KHs are very useful in difficult situations. But the core KH (mostly debuffer e.g. Amat, Cthulhu) is always useful (maybe except the union event where you can rely on other members' debuff), making them better options for the miracle ticket.