I agree with the original question, and moreover would add that "click the link in the email" is terrible advice from Comcast. That's exactly how to get caught in a phishing scheme. The advice should be: login to your Xfinity account, and go to such-and-such page to see recent account activity -- which leads us right back to the OP's original question.
I would love to know how to see all recent activity on my Xfinity account. This is something that is trivially easy (and very obvious) to do with, say, Netflix, or Amazon, or any of a dozen more reputable services.
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