I'll just put this here. Then you'll understand why this decision was made:
This is a boss that was NOT meant to be a pushover. Considering who the boss is, you should understand why. She was nearly impossible in version 8. So I nerfed her a lot. More importantly, I was worried that this boss would be a repeat of version 8, so I nerfed her even more. Unfortunately, Nitro made her look like a pushover. So I re-buffed her. But I over did it, so I nerfed her a little after that..while adding that little counter attack she does to keep you honest.
version 9's new features definitely overwhelm many people, and some thought the game was too hard right from the beginning. However, there are others who didn't complain about how hard the game was. They adapted and picked the game apart. These are the kinds of gamers the hack was meant for, so I took the kid gloves off. However, an easy mode was made so all gamers can have a chance to experience and enjoy the game.
In the final boss's case, it's all about team building, Item managment, stats(which is why the respec feature is a thing), your equipment, and a little luck.