They have been commonly used in camper and RV construction for as long as I can remember and much much longer here in the US. I have never used them on a deck but they are readily available for that purpose at hardware stores here. I always used phillips head screws for decks. I even have an automatic screw gun for that purpose that takes clips of phillips screws. Never heard of them being called Robertson either.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!