Some people have obliquely addressed this, but since you mention you're an MS4, this is a good thing to explicitly discuss for learners -- hydromorphone (Dilaudid) is a very different drug than morphine. This is why you're seeing some back/forth between attendings about using it. At a pharmacologic level, it is acetylated in a similar fashion to diacetylmorphine, AKA heroin, and for this reason it crosses the blood brain barrier and provides a euphoria / high that is unmatched by morphine or most other analgesics we use in the ED. Even at equianalgesic doses, the feeling that people get (I imagine, I have never personally experienced this) is qualitatively different than what they feel from morphine or most of the rest of our armamentarium.
This is why I choose to reserve hydromorphone for either confirmed badness or end-of-life care, and avoid it for the treatment of acute on chronic pain or vague abdominal pain or most anything else. I think there is a qualitative difference that promotes drug seeking behavior specifically for this drug that is rooted in its pharmacology, and that its use can truly harm patients. It seems to lead to the creation of patients who say that "morphine does not work" for their pain, and who will come to the ER again and again to receive this specific experience and who will complain if they don't get it. I will use it as well for certain pre-existing conditions, e.g. chronic kidney disease or chronic liver disease, where this may affect the metabolism of the drug or the build-up of certain metabolites, but think there are seriously compelling reasons to avoid it as your first-line analgesic.
The treatment of pain in emergency medicine is a huge part of the job. It's worth taking time to really understand the options you have available, and how to tailor your treatment to the patient and the condition in front of you. You'll do better by your patients, and will be appreciated by your nurses and your colleagues, if you do so -- unfortunately this will mean that there's not necessarily a great one size fits all solution, but if you recognize that and act accordingly, I think you'll be a better doctor for it.