Re: MetaGuard
"There's exactly zero valid technical reasons to link privacy and accuracy."
I believe the slider relates to how aggressively the privacy app works to anonymotize you. The proposed privacy app works by adding noise to the VR data. Added noise means better privacy, but worse accuracy.
To oversimplify, if you're exactly 2m tall the app could make you appear to be 2.02m tall. Your view of the VR world will be offset by 1% from the "correct" view. If it made you 1.8m tall, your view would be offset by 10%.