Let's make an analogy. To drive a car one needs to "know what they are doing" to the point that driving licenses are mandatory. Let's consider a common accident type: a collision because you turn but your directional lights remain off.
If it happens because the driver just forgot to signal, it's a mistake and it's hard to blame the car.
It's like knowing what transaction isolation levels can be used, but asking for the wrong one or trusting a random default.
On the other hand, if the directional lights remain off despite pulling the lever because the car is in a probably illegal power-saving mode, activated by turning the headlights off, and the driver should have reactivated directional lights with an ambiguously named item in the depths of some options menu, blaming the accident on user error would be very partisan: it's the car that doesn't know what it's doing.
It's like figuring out the correct transaction isolation level according to DBMS documentation, asking for it, and expecting it is actually used.
