I completely agree with you, I find this "disable antivirus" to be such a bad advice! Yes, it may work for tech savvy or security aware person. If you know what you're doing you're much less likely to get into problems. It won't work for general public though.

And the argument being made that "for example, see bugs in AV products listed in Google's Project Zero. These bugs indicate that not only do these products open many attack vectors" could be made for any piece of software your install.