>Other than being US focused it seems like as reasonable unit as any.
...Majority of the world uses metric. People actually do print slides and may want to design it for both printing (where the paper is metric) and display.
...Majority of the world uses metric. People actually do print slides and may want to design it for both printing (where the paper is metric) and display.
And the authors suggestion of pixel seems worse, even to me living in a metric-first country. I would take inches over px as a default (but give me mm please).