Not OP, so can’t comment on the vaccine part but the “modern medicine isn’t modern” is actually a cute analysis. When it comes the healing major woulds, even ones inflicted intentionally like during surgery, we don’t actually know how to heal the body. We know how to clean the wound. We know how to remove malignant tissue. But we don’t actually know how to heal the wound. The best we’ve got is “keep it clean and let the body do it’s thing”. To OPs “poison” point, when it comes to things like antibiotics, those are really just other stuff in nature that we found out kills stuff inside us. It also kills stuff we don’t want to kill inside us, which sounds kind of poisony. Chemotherapy and radiation treatment are similar - just dose this person with this stuff and hope the thing we’re trying to kill dies before the person does.
Surprisingly vaccines are probably the most “modern” example we have of medicine, especially the RNA stuff.