Basically, earlier programming languages including most of the C derivatives were built with computation in mind. That sounds silly, but I mean it in a specific sense. A lot of new technology from that era was about computing interesting results (compressing, multimedia, etc).

Today processor growth speeds have stalled, but data capacity is still on the uptick, however slowly. Most new apps nowadays are 90% data processing, with only a little computation on that data in between.

Data programming appears all over the place. Most web apps? Most web based startups? Apps designed around organizing data in a clever and/or attractive way. The main job is collect and move data round.

The recent renewed interest in function programming comes from its focus on data, just as imperative models focus on computation. Consider: modern FP languages typically have strong data typing and elegant ways to ferry around data with bits of computation done on it in between. Meanwhile imperative languages make it easy to process a data stream, but don’t help you much with moving that stream around. In fact, modern imperative languages have recently been based on weak typing and dynamic models, having only recently started to rebound back into the land of strong typing.