@LillyHerself Lots of wood-joinery use. Pretty much all deck screws are Robertson here. They're not as commonly in machine screws, or electronics, but we don't build a lot of that domestically.
All electrical receptacles, light switches and boxes - everything behind the decorative plate really - are Robertson here. Often Phillips compatible too.
Many hinges on doors are Robertson here. A lot of us will throw away the phillips wood screws that come with anthing and use our own Robertsons.