Since you are making the more extraordinary claim, you need to provide evidence that your computer usage practices are 100% infallible to sophisticated attacks against you by people who know a lot about you.
How do you prove this though? It's the classic "you can't prove a negative" scenario. I have no particular desire to associate this account with my real name or I would post my work email here just to let people try.
Oh sure everyone can be vulnerable to certain cons. Fortunately all spear phishing attacks can be very easily avoided through technical means. I guess those who down voted me must be unfamiliar with the functionality available in current enterprise email systems.
That's great. Not all spearphishing comes in via email though. See Dark Caracal or Magic Hound for relevant history here.
Also fraudulent invoices are another form of spearphishing that you'll still have a pretty hard time against.
I don't know, I'm also on the operations side in a large enterprise and I help with our internal phishing efforts. Pretty sure I'm familiar with the same tools that you are and I vehemently disagree with your assessment.
