In the Dragonlance Chronicles, Raistlin is written in a way where he literally cannot lose an argument.

I am only a few chapters into Dragons of Autumn Twilight and I already need to vent about Raistlin. Raistlin is a walking appeal to authority.

You can't argue with someone like that. They would always just say "well I have the authority to know what I'm doing. I have this staff of Magius. You wouldn't understand."

Raistlin is like one of those doctors who is always right, no matter what happens.

If something doesn't work, he can always say “Oh well, that was not within the power of the Staff of Magius.”

That kind of doctor could always say "the outcome you wanted was not within the scope of what this medicine could do.”

If the treatment does work, they get to say “See? this proves my brilliance. That proves the power of the staff.”

And if anyone questions someone like that, they can always fall back on, “I am the one who studied this for years. I am the one who suffered for this knowledge. You cannot possibly understand.”

In Raistlin’s case, he's walking around with gold skin, a frail body, hourglass pupils, and golden irises. He has all this from learning how to use the staff. So that's the authority he could cite to.

I'm willing to bet that Raistlin has trolled some people over the years. He's probably used his staff to promise things that were impossible. Then he was like "sorry, that wasn't within the power of the staff!"