As others have noted, part of the issue is Star Trek has always treated medical tech, much like any other kind of tech, as sort of a formless plot device full of one-off solutions to problems. I'm really not into medical dramas in particular, but my understanding is part of what makes people like them is they are fairly "hard" in terms of scientific/medical knowledge, referencing real diseases, drugs, and procedures. A Starfleet Medical show would have to sift through what's been established regarding medicine across all of Trek (which is 100% nonsense) and try and develop some internally consistent "rules" under which the doctors operate, otherwise the show would begin contradicting itself quite rapidly.