Fair point, but depending on the interviewee, you might get very different answers and/or follow up questions.

Even if they assume something, it might be just for the sake of the example. If they're competent, they'll follow up with another example and so on, depending on how exactly you pose the problem.

If you present it as an abstract question, one possibility is that you get an abstract answer. If you present it like a ticket with no description, you might get prompted to clarify.