He's obviously right about the noun/verb thing. You can just look this up on Google Scholar. I think you're sort of broadly wrong about how fussy the definition of a "sandbox" is, but you're at least saying something coherent there, even if it's an idiosyncratic definition.

I already gave you a link above with a definition of sandbox, the noun, and a list of example technologies that it applies to.

If you’re going to get fired up about people you feel are misusing this term, and then ignore citations about its actual definition, I think the ball’s in your court to back up your claim.

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