I think it's more that the undoing tool is not that ergonomic/user-friendly.
In what way? You can use a spanner or in a bind stick a narrow rod through it (eg Allen key or screwdriver) and undo that way? You do have to push it against the mating piece otherwise it can slip.
Yeah it is slippage between the tool and nut which infuriates me - of course this is significantly user technique (or lack of) as well as the design. But it would be tricky to use a spanner on mine - no obvious flats to grab, and the tool hinges in the middle, so it's very floppy:
In what way? You can use a spanner or in a bind stick a narrow rod through it (eg Allen key or screwdriver) and undo that way? You do have to push it against the mating piece otherwise it can slip.