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Disabling user-scalable (namely, the ability to double tap to zoom) allows the browser to reduce the click delay. In touch-enable browsers, when the user expects the double tap to zoom, the browser generally waits 300ms before firing the click event, waiting to see if the user will double tap. Disabling user-scalable allows for the Chrome browser to fire the click event immediately, allowing for a better user experience.
From Google IO 2013 session https://www.youtube.com/watch?feature=player_embedded&v=Dujf...

Source: http://stackoverflow.com/a/16910559

I doubt that's why. In this case, as the site doesn't appear to render well at all on mobile in the first place, that meta tag was probably just blindly copy pasted from somewhere else that did have a responsive page.

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