Repeat after me:
Everyone can be spearphished.
I mean it. Everyone.
Everyone can be spearphished.
I mean it. Everyone.
There's a con out there for everyone just like there's a lid for every pot.
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.