Hmm to me the TF2 Medic seems like more of a Rogueish archetype. Being a kind of mad, backalley doctor who isn't exactly law abiding. My intention was to make a very physical sort of support class as medical practice, even non magical ones, does not seem at all explicitly fighter based
For me a subclass cannot step on the toes of something other classes can have, and if it would make sense for various archetypes to have a distinct element it should be a feat instead
Poisons is definitely more of a rogue thing also, that or a feat - just like in the relatively recent UA which did have a feat for this sort of thing. It looked like more of an offensive application of it though