re: What advantage, if any, is having rotating QBs

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Less fatigue? That's about all I can think of as an advantage.

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If both quarterbacks are mobile, yeah, fatigue is a factor. There is also the advantage of watching what the defense is doing from the sideline. You can also send a package of 3 to 5 plays in with the QB on the exchange - that avoids or reduces the need for all the flash cards, cryptology and other stuff to keep the other defense from stealing your sideline signals.

It does give the center (and other OL) a challenge to adjust to the new QB - this can affect ball security on the snap and increase false starts.

It's not a panacea - it's not the end of the world.