Only security experts can understand what the Windows system provides in terms of security, making it easier for normal people to get an antivirus from third parties. Not everyone burns their eyes readingZeroDay did not say so. He thinks that WD + properly tweaked Windows built-in security can give the home user similar or better protection than any AV (including Kaspersky). He also said that Kaspersky is more convenient.
I share this opinion, too. But it is also true, that Kaspersky's users do not have to learn many things about Windows built-in security. Kaspersky's products are more compact, easier and more convenient for most users. WD + properly tweaked Windows built-in security, has the advantage of being the most system compatible solution and it's free.