For the past twenty years or so, I’ve had a clear image of what a product launch keynote is supposed to be like. A charismatic executive walks across the stage, points to some animations and pre-taped clips, a live demo or two happens, and the crowd goes wild. Clips proliferate on social media and cue the online discourse. You can trace it back to Steve Jobs dressed in a black turtleneck, with a glint in his eye, walking across a stage, asking if a hyped-up audience is ready for one more…