If a wheel comes in, I do a split second evaluation before hitting it with triflow or not: older wheel with dull nipples showing signs of corrosian, esp. aluminum nipples? Oil for sure. Shiny new nipples on a new-ish wheel? Don't bother.

And if someone questioned me about this, claiming some other mechanic said they should run away if I don't oil them, I'd say that I don't deal in absolutes and perhaps they should avoid that particular mechanic. And also, they could have their wheel back to take to that particular mechanic if they want.