I'd never even heard of Robertson before but had seen funny square bits in cheap screwdriver bit sets and wondered what they were for. They're just not a thing

I'd never even heard of Robertson before but had seen funny square bits in cheap screwdriver bit sets and wondered what they were for. They're just not a thing in the UK, or at least in Scotland. It's interesting that a lot of cheap DIY store stuff is coming with Torx screws, and indeed Lidl often sells packs of actually quite nice Torx wood screws in various sizes with the correct bit included.