Being better (faster and more accurate) than "the other guy" is the thought that keeps me training. If I am standing across from Doc Holliday I'd like to at least think I have a chance. I am nowhere near there yet.
I agree that times given in various standards are not the end all of training. However, it does give guys like me an idea of what is possible or average for time and accuracy. In other words, I would be supremely confident in my shooting skills had I not seen Bob Vogel shoot an El Prez in 4 seconds.
So yes, use time standards as a benchmark, but always push. Also, train with people who are better than you, be it in class, or better yet, informally.