Some of the takes in here are just wild. I never thought I'd see someone argue that STDs are a reasonable 'consequence of their actions', implying they shouldn't be treated or something? Occupation-related conditions and injuries exist all over, not just in sex work. Since the MC is about idealistic as one can be about treating everyone he can, I'll just say he probably disagrees with that sentiment. I'm sure he would prefer to treat EVERYONE, including the people who originally spread it. If that ideology bothers you, then I'm guessing this whole story is really gonna get under your skin.
As for me, I'm finding this isekai to be more rewarding than I expected. I can understand wanting more uncertainty because someone who always succeeds generally does get boring, but considering this is rooted in more practical application of skill and knowledge I'm more willing to accept 100% success rate since it's not just handwaving 'I'm going to break all the known limits (like RPG stats) and be the most powerful entity ever' stuff where that usually applies.
If I did have any concerns, it's more in the tokenization of each race supplies a specific thing for an ideal fantasy hospital, and THAT feels a little too... convenient? Contrived? I'm not at the point of being disatisfied with where it is now but I think it'll be hard to balance that vs the original claim "anyone can learn medicine". It's not a dealbreaker but it does sort of go up against the premise when everyone has a specific niche by virtue of their race.