This is not uncommon. There's lots of issues where there are no easy answer and even if you know most answers, the solutions are "there is ~20% chance this will

This is not uncommon. There's lots of issues where there are no easy answer and even if you know most answers, the solutions are "there is ~20% chance this will help, if not there is ~15% chance this will help, ... etc.". And that's assuming you can identify the real problem not masking as something else. Dealing with the uncertainty is part of the job. Ideally you'd want the doctor to explain it to the patients too. But I wouldn't say they create the frustration as such. The frustration is that nobody know better answers.