Why the bleep do they still rely on wifi at conferences like this?? I always insist on a wired connection on its own, dedicated, presenter vlan. Is this runni

Why the bleep do they still rely on wifi at conferences like this?? I always insist on a wired connection on its own, dedicated, presenter vlan. Is this running on wifi-only glasses or something? Is that the only medium they can present the tech on? Could they have shielded the room the guy's in?