Understandable, but something like an EpiPen and a lot of other very well established things like say, insulin. They're well within the realm of a stable generic that can be managed as to maximize the amount of lifes it improves. Right?
Different bodies also respond very differently to all the different kinds of insulin available. There is room for further improvement as the typical lantus/lispro regimen isn’t perfect for everyone.
Insulin is hard to manufacture. The older versions are now generic, but the new, patented ones have measurable advantages. Because most people have insurance coverage, there is a limited market for the older, generic insulin.