Having an antivirus installed has so far consistently proven to make a system vastly less secure, degrade performance and reliably break a number of application

Having an antivirus installed has so far consistently proven to make a system vastly less secure, degrade performance and reliably break a number of applications you might actually want to use. All of them have just fallen apart at the slightest scrutiny and they are routinely programmed by the last kind of people you want to design and implement them. The whole concept is just useless. Scanning all system IO for 20 year old BIOS viruses is a pure waste of energy.