Sure, there's a subjective element to it, and I'm not actually arguing that [2,1] is better than N (I don't, that was just an example to explain how the notation works.)
The fact that it is less compact is almost meaningless to me. Easy to understand and easy to parse and implement is what I consider important. These long moves are very rare. No need to be cryptic to save a character or two. I also consider NN to be unnecessarily bad and I don't support it either. I use N0, which Betza also suggests.
Sure, there's a subjective element to it, and I'm not actually arguing that [2,1] is better than N (I don't, that was just an example to explain how the notation works.)
The fact that it is less compact is almost meaningless to me. Easy to understand and easy to parse and implement is what I consider important. These long moves are very rare. No need to be cryptic to save a character or two. I also consider NN to be unnecessarily bad and I don't support it either. I use N0, which Betza also suggests.