I didn't even have fraud as a use case on my radar, but social engineering attacks will be completely reimagined.
Do you really think that most employees would need more than that?
But yes, at my current employer, I believe no one would do that just based on an email and a phone call. But then I dare say that faking Swiss German is an order of magnitude harder than faking English.
Someone has compared the typical cadence of Schwyzerdütsch to riding a donkey over very rough mountainous terrain, and I'm inclined to agree.