I don't disagree with your first point but I think much depends on a person work ethic and what it means to them to do a good job. An engineer worth their salt would understand that success is not only writing the fun bits but also: the tests to make sure everything works as intended, documentation for their failing memory and having other contribute, bug fixes because we can't have those laying around, ...

As is, the signal is too weak to know if the person just wants a toy to play with (I doubt) or if they are ready for the full package because they understand it's how it should be done. Definitively a point to check thoroughly before hiring – but it would be the same for other candidates, right ?