That's referring to the user being < 1 ft from a virtual object, not a physical one.
The docs say "Currently we do not recommend to having interactions with objects within 30 cm of your view for prolonged periods of time. When users approach too close to content for us to display, fade content out gracefully rather than sharply clipping the view."
The docs say "Currently we do not recommend to having interactions with objects within 30 cm of your view for prolonged periods of time. When users approach too close to content for us to display, fade content out gracefully rather than sharply clipping the view."