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.
In this case the screw was at the bottom of a narrow slot, and they only found it after breaking things.
They didn’t find the screw by breaking the blender. They were able to reach it with a screwdriver before that, just not the right one. They broke it because they were too impatient to find a way to look into the hole and then find, make, or buy the right tool.