I wonder how much overlap there is between users of array languages and of scientific programming languages/dialects like MATLAB, Numpy, and Julia, which are also optimized to operate over arrays. In other words, do K/Klong/whatever proponents realize that there is already a huge community of people who appreciate and utilize powerful operations on arrays to do real work, but just prefer to write something like "max(diff(x))" instead of "|/--:'x"? It's almost the same number of characters and it doesn't require learning a new writing system.