Whether it be electronics, automobiles or medical equipment, the manufacturers should not be able to horde “oem” parts, render your stuff useless if you repair it with aftermarket parts, or hide schematics of their products.
Summary video by Marques Brownlee
Great channel covering and advocating right to repair, Lewis Rossman
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.
But they're in no way single use.
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
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.