I think the point is to be able to predict the answer without actually trying it. If I know I like X and Y, and I can see that Z has a very similar force curve,

I think the point is to be able to predict the answer without actually trying it. If I know I like X and Y, and I can see that Z has a very similar force curve, then it's likely to satisfy one of my preferences. I might have others - e.g. sound and key spacing - but that just suggests other measurements that should also be made. Having more detailed/accurate force measurements still seems like a good thing.