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.
Just a basic security screw. It's so kids (and people who don't know enough about repairing appliances to know about security screws) don't disassemble the dangerous machine.
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
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