Truly "privacy-focused" smart glasses wouldn't have gesture- or voice controls: because it wouldn't come with cameras nor microphones. It wouldn't allow ambiguity surrounding the ability, for these devices to collect personal data without consent: "trust me bro" toggle switches (controlled by the wearer) don't provide reasonable reassurance, to those in the vicinity of such sensors. Which would pretty much leave a heads-up display, which isn't something for me: I like clear separations between the digital and physical world, and this seeks to further blur that line; together with the obvious surveillance implications of course...