You're sometimes right, but sometimes really wrong.

I had a candidate for a 3d graphics job, who showed me incredibly impressive things he'd programmed like very realistic water simulations, etc. He talked us through them, was incredibly articulate and clearly knew his stuff.

He completely bombed the coding exercise. It was something like: given 2 hours alone at a computer, with a threejs scene already setup, make it display a few cubes at different heights, colors, etc. Full access to internet, google, etc.

He couldn't get one cube to show up. That's maybe a two line piece of code when given the entire environment already set up, and you can find it by googling Threejs tutorial and copying like the first example.