I agree, I definitely want to be able to use Google Authenticator instead of a service-specific app. It seems to work the same way, seeing how it supports other apps. Not defending Comcast here, but if I had to take a guess, they might have a preference for only relying on software that they can update. They seem to have done the same thing when they migrated router settings over to the xFi app when the router's own settings page worked just fine.
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