The real problem here is optics. There are certainly many valid technical and business reasons to target specific browsers - we've heard them all back in the day when "Best viewed in Internet Explorer" was a standard disclaimer on more than half of all websites out there. That arrangement did not work to the advantage of either the users or Google, though. So Google invested significant resources in web standards and alternative browsers, breaking the Microsoft monopoly. But now that Chrome is rapidly approaching the position that IE held, the users and the web developers are getting a feeling of deja vu, and Google's behavior - however motivated - plays right into that.