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Well, to be fair, N2 filled tires will generally experience less of a pressure fluctuation than air-filled tires, and that's because they use dry N2 for tire-filling. Air, on the other hand, contains water vapor which may condense out inside the tire, causing tire pressure to fall. If the pressure is bumped up, and then the vehicle is driven on those tires, the condensed water vapor will evaporate again due to tire heat buildup, and tire pressure will go up.
You could get the same performance of N2 if you took out all of the water vapor from the pressurized air. However, nobody in their right minds (?) would pay extra merely for "dry air" tire filling.
I'm certainly not going to rush out anytime soon to replace the air in my tires. They're good enough for now.
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