Re: [w3ctag/design-reviews] WebXR Plane Detection Module (#620)

Hi @bialpio! We're just having a look at the ex*plane*r in a TAG breakout session and I'm coming up with a few questions. First of all, I think it could go into a bit more detail on the user need.  Can you give a few examples of where plane detection becomes important in the context of a WebXR application?   The answers to the security & privacy questionnaire look good but do not seem to be fully reflected in the explainer of the spec itself? For example, the quantization of planes is mentioned as a mitigation strategy against privacy attacks in the questionnaire response but this is not mentioned in the spec itself. I think this would be a lot stronger (and less prone to fingerprinting) if the quantization and other mitigation strategies were spelled out in the spec. Finally, you mention synchronous hit-test but it's not clear from the explainer how this fits together with the [hit testing](https://immersive-web.github.io/hit-test/) specification itself? What does this technology provide over and above what WebXR hit testing?  We may also have feedback on the API to share - but I wanted to get this out to you quickly.

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