Cycles Users: Beware of Square Samples

Richard van der Oost writes:

There is a sneaky render setting in Blender that can increase your render time by 128x (or more) with a single click. It’s called “Square Samples” and if you’re not familiar with what this setting is doing, you might be in for a bad time!

Why was this setting added to Blender, and was it a good choice?

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