To be frank, not really. The best thing about Izanagi No Okami is that he's so goddamn strong. He can tear through just about any fight in the game without an issue. But while the power trip may be fun at first, it quickly loses its luster on your first playthrough. If you still desire something stupid powerful, you're still able to fuse things like Lucifer with an almighty boost or almighty amp to get incredible numbers with not much effort. On second playthroughs, you don't need Izanagi No Okami because you can just buy back your strong personas from the compendium, including your stupidly strong Lucifer. That aside, Persona 5: Royal is kind of straightforward. I didn't struggle with a single fight until I got to the literal final boss. He's fantastic to have, but Izanagi No Okami completely destroys any sense of balance the game had. It's made even worse by the fact that all DLC personas are free from the compendium on your first purchase, meaning you can be level 1, with a level 80 god-slaying monster as your persona. At that point, you're just playing the game for the story, so save your money and put it on Very Easy difficulty instead..