That came across harsher than I meant, I apologise.
What I mean is that I don't really see the argument here, I think it's a better idea to just let physicians do chemistry and keep the roles as is, so that physicians can use the in game chemistry codex to make the chems they absolutely need (hence, common sense), and much like engineers leave atmos to atmos techs when they are on, so should physicians leave chems to pharmacists when they are on.
Mind, a similar dichotomy to what we have in engineering already exists in medical as is, Atmos techs are soft expected to know how to set up power for the ship, pharmacists are soft expected to treat people when no one else is available to do so, it's just that in medical it doesn't go both ways.
I still support a merge just on the grounds that it's a marginal improvement over what we have right now, but keeping roles, slots etc etc as is and just letting physicians do chemistry both keeps pharmacist as a role and allows medical to function properly without one.