Many things are valuable. Conciseness per se is valuable (I don't think you will argue in favor of unnecessary verbosity in programming). However, of course this is just one of many factors, and any programming language will have to find a balance between these many factors, depending on how important each is, and so on.

If you think you are getting conciseness by decreasing readability then you probably have a balancing issue, but if you can get more concise code without decreasing readability then that's good news.