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@gbj_tester
Fat tyres and rims are heavy, so they take a lot of stopping. Big rotors just reduce the brake lever force needed to do the job. Fat wheels are also quite a bit bigger (rolling diameter) than normal 26" MTB wheels, so you'd need to increase the rotor size just to maintain the same mechanical advantage.
I have 203mm front rotors on my MTB and Pompetamine, the extra few grams for the big rotors is well worth it for the easy power and great modulation. I don't think I'd ever be happy with titchy rotors again.