Pharma companies spend a majority of their time trying to make new unique drugs, they just fail most of the time. The ones that succeed tend to be ones that are similar to ones that succeeded in the last, which is why you get multiple drugs in the same class, but it’s not all they do. For example, we’ve essentially cured some types of cystic fibrosis, and there’s an effective vaccine for malaria now - all developed in the last 10 years.
I don’t want to pretend that the big pharma companies aren’t evil, but they do have incentives that align with improving human health.