Basic blender went bad (motor ran but spindle wasn’t rotating). I wanted to disassemble to see if it could be repaired. Three of the four screws were Phillips head. I had to cut the casing open in order to discover why I couldn’t unscrew the fourth. It was a slotted spanner.
Though it should be noted this does raise the bar above most people, especially on a budget, single use tools are hardly ever worth it.
Arguably more dangerous things have easier screws too, like electricity outlets
Grinding a notch into a flathead screwdriver is annoying but it’ll still work fine as a flathead even afterwards. I would probably just grind the bulge out of the screw though.
In this case the screw was at the bottom of a narrow slot, and they only found it after breaking things.
But they’re in no way single use.
I have a set of these that was part of a larger set of precision bits I was buying anyway. I’ve only ever used one of the security bits in like a decade of having them. I wouldn’t have bought the security bits alone.
That’s more than some sockets or crescent wrenches I have from sets. I don’t know that I’ve ever used an 11mm of either.
I can’t say personally any of my appliances have had this screw, so again relative to someone not doing this for a living it very well could be