Thanks for that link. The original blog (and the thread of replies) makes for interesting reading.
I've always wondered about the evidence for the utility of AVs. I always took it on faith, much like I believe using seat belts makes sense, even if I never benefited from them. (In 20 years of using/testing AVs, I've never been alerted that anything really nasty was blocked. A few false positives and the odd PUP were the worst I've seen). And of course the malware removal forums are full of infected logs that include AV protection.
In my Pantheon of Protection, I've always placed AVs near the bottom. Yet I continue to use them - although I abandoned the paid versions years ago as unnecessary. As the OP points out, maybe all the average user needs is Windows Defender/MSE, which are free.
I have to wonder what the OP would think of Malwarebytes 3.x. Malwarebytes claims it is not an AV, yet can replace your AV, using a completely different technology that blocks malware equally well. (Although I avoid paid security as a rule, I was fortunate to purchase a few lifetime paid subscriptions to MBAM years ago, which I never regretted).