"It will never work,"
I show them how it works.
For example, recently I had to make some pictures for a publication about yoga. The model was only a few hours available, and, of course, at the worst time of the day in the early afternoon. The sun was shining directly into my lens. And the pictures needed to be made on this specific location, near the water.
This looks like an impossible situation.
With the right gear.
When you have the right gear, you have no problem to resolve such setting. I mount the Skyport Plus HS trigger on my camera and make the composition for the shot, with the Sun above the model.
I measure the sky and I underexposed it almost 1,5 f-stop getting a darker background.
The Sekonic Litemaster Pro is the perfect meter for this work, it remotely triggers the flash too.