There are zero arguments against a new class that is not as powerful. That is my point. It is never about not as powerful. It is always about more powerful. The ability to take without conceding. Here are a few examples:
- Racial ASIs: I want to place my plusses anywhere because I must start with a 16, not a 15. I know I get the benefit of all these other cool racial feats, but I want both. Hence, more powerful than the original PHB intended.
- I don't like that my ranger can do all these cool things, but does 1.2 less damage per round than the fighter. The fix, ranger does all these cool things and is now stronger than the fighter, doing 2.3 more damage per round. Hence, more powerful than the original PHB.
- I want to be able to fly at first level. Even though the intentions of the designers were clear and specific - flying is a powerful tool reserved until a wizard reaches fifth level. When they wrote the PHB, they adjusted it so it would come later. The fix, the wizard can now fly at first level.
Heck, even right now people are arguing for being able to mix and match racial feats. There is no story behind this. It's all because they want to pick the best ones for their class. As I said, half the debates on here are because people want expanded powers - not to "tell their character's story," but to have something more powerful. For we all know, flavor wise, you can tell any story you want without making your character stronger. Yet, suspiciously, every debate just so happens to make characters stronger.
So the argument against a class that is the same power. There isn't one. The problem is - that is never the real argument.
To prove my point.