When skirt lengths change and we observe no measurable change in human anatomy, that's fashion and to follow fashion is "hip".
When the computing platform changes and you have to start paying attention to L-level caches and counting your bytes (so you can do you big compute in memory), and use n cores, and then arrays are adopted, that is not fashion; so not "hip", rather modern.
When the computing platform changes and you have to start paying attention to L-level caches and counting your bytes (so you can do you big compute in memory), and use n cores, and then arrays are adopted, that is not fashion; so not "hip", rather modern.