Just one man's opinion, but the article is not baseless - textbook style convective weather phenomona can change very quickly, hence the concern. That said, it (NEXRAD) offers something traditional airborne radar sets can't display very well: The big picture. And it will display the big picture over time: it animates the weather movement. It's like the difference between what a scuba diver sees, through his mask while he's bobbing on the surface vs. what he might see sitting atop the conning tower of a sport fishing boat - though not in real time. A really Guccied out fancypants bizjet probably has both. Most of us airline guys have radar alone. It works pretty well, once you learn how to read the tea leaves.