It really isn't. Think about it for a second: how hard is it to spot phishing attempts when they are sent to an email address you know for a fact you're not using with a service?
And how vulnerable are you to phishing if your special-purpose email address that you only use for one specific purpose receives zero spam?
To claim that the most basic and easy internet security precautions are at a "crazy level", first you need to somehow believe that no one is targeted by these schemes. But somehow there's a whole international industry that thrives on stuff like Western Union transfers. Why is that?