How is this insightful? Joanna knows something you don't: A/V only protects you against trivial exploits and rootkits. Anything slightly sophisticated, and your A/V is useless. Joanna assumes that if something manages to get passed her security "perimeter", an A/V certainly isn't going to stop it. (what such things might be? Well, CPU exploits, rootkits which VM your OS, etc.)

Now everything is a nail...

It's not about threads, it's about load-management.