Nurse was removed because it was a functionally useless alt title. I'm not sure where people are imagining that it was used for roleplay, because it wasn't: the one nurse character that I can remember did the exact same thing a physician does now. There's not really enough content for nurse to even consider that people might do something creative with the role, because they already can as physician. Why aren't they? The truth is that the much coveted "patient RP" is completely inexistant and will forever be. People don't want to be stuck in the medbay for more than they have to because it's utterly boring. This is because when injuries actually happen, there's going to be a large influx of patients or that person needs to get out ASAP, because more than likely they're a security officer.
On that note, I also don't agree with the assessment that job bloat doesn't exist. It's a very real thing. Example: do you remember when we had roboticist alt titles and people would regularly play mechatronic engineers? That all seems fine and cool until you remember that there were often cases where two roboticists would play mechatronic engineer and give a gigantic middle finger to IPCs that got wounded or borgs in general, because they limit themselves to playing a roboticist that only makes mechs in a limited slot job. This is a real problem and it exists in other forms, too: like people described, the path a patient takes through medical (lobby -> stabilization/scanning in the GTR -> surgery) doesn't allow for a third role in the midst of it all. This is why it's been streamlined to physician and surgeon; a nurse role is going to inevitably step on the toes of a physician and rob them of basically the only purpose their job has, considering that the only times they ever do surgery is when surgeons are lacking. That's not really something I want to happen. And the prospect of a nurse only playing to do patient RP is pretty ridiculous, one that I'm not even going to entertain.
This is why I was against nurses being re-added - I do admit there's bias since I was the one that removed the role entirely, but I haven't seen much of a convincing argument.