Treat vs cure. You treat them so you can go on treating them. If you cure them, maybe you’ll treat them later and or maybe you won’t - but that’s outside the current bonus cycle / opportunity window.
I'm not sure I agree, when we humans only lived for 50 years there were no time to develop any range of other diseases that we are experiencing now in later life, so even if you cure A there will definitely be many many opportunities to treat anywhere from B-Z.