[MisterTea]

> I can't think of any reason why you'd want to use Schottky diodes to protect op-amp inputs

My first guess would be the fast switching time of the Schottky makes them appear useful for responding to transient events.

[rcxdude]

They also have a low forward voltage and an actual current rating, so it can be easier to trust that they will clamp a voltage within range indefinitely.